Wang Lun followed the stream, intending to find a higher spot to divert water. Finally, about ten minutes from the camp, he found a large rock blocking the stream, causing the water to overflow and continue flowing towards the sea. Having identified the source, Wang Lun continued towards the camp, observing suitable locations for building a waterway. He marked suitable spots, made minor adjustments to unsuitable ones, and for truly unsuitable areas, he cut four small branches from the nearby bushes to make a frame and placed it there. Then he continued on, walking very slowly.

Inside the campsite, Li Ling washed the pot, then filled it with water and placed it on the campfire. She then gathered some wild vegetables, setting aside some for later. She put the remaining bundles in an empty basket and washed them by the stream. By the time she returned, the water had been boiling for quite some time. She put the vegetables down, grabbed a handful, and placed them in the pot. When the vegetables were half-cooked, she used chopsticks to lift them out and place them in a prepared basket. She then added more vegetables to the pot, carried the basket to dry the vegetables on the fence, and returned to add more. She repeated this process more than ten times before finally finishing blanching all the vegetables and taking a break.

After resting for a while, Li Ling washed the pot by the stream, carried a pot of water back to the campsite, put it on the campfire, and prepared to boil it before drinking it. Then, she took her machete to process the large bundle of bamboo. Li Ling planned to split the bamboo in half first, and deal with the rest later. It took her more than ten minutes to split most of the bamboo. She had to cut it in half lengthwise, and then remove the nodes to make waterways. However, before that, Li Ling went back to the campfire, took the water down, added another piece of firewood to keep the fire burning, and then moved a rock to sit beside the bamboo and process the nodes. Since she only had a machete, she had no choice but to roughly cut the bamboo first, and then use the machete to trim it, trying to make the nodes as smooth as possible.

About half an hour later, Wang Lun returned and saw that Li Ling had only just finished processing the bamboo, so he went to help. However, since Wang Lun was carrying a large cleaver, he did the initial steps while Li Ling used a machete to trim and smooth the bamboo joints. Working together, they quickly finished processing all the bamboo that Li Ling had split, taking about another hour.

After resting for a while, Wang Lun carried more than ten processed bamboo stalks towards the designated source. Li Ling moved the rest of the bamboo outside the camp, closed the gate, and also took some bamboo with her. As Wang Lun approached the source, he estimated it was close enough to place the bamboo there, so he put one down every few steps until he reached the source, just in time. Then they began setting up the waterway. Once Wang Lun had finished the first stalk, Li Ling arrived, and the two began laying the waterway. Fortunately, Wang Lun had spent some time setting up the frame beforehand, so now they only needed to adjust the height and secure the bamboo.

The two worked for over an hour, almost reaching the campsite, but then realized they were short a few bamboo poles. Wang Lun told Li Ling to stay and build the waterway while he went back to quickly gather some bamboo and bring it over. Their current location was close to the campsite, with a clear view of the bramble fence, so safety was assured. That's why Wang Lun suggested he go back to gather the bamboo while Li Ling stayed to build the waterway. Li Ling agreed, and Wang Lun quickly went back, gathering five bamboo poles in a few minutes. After splitting them in half, he had ten poles—enough for the job. He then placed one pole along the path until he connected with Li Ling. After another ten minutes, the two finally completed the waterway into the campsite. The outlet faced the pit Li Ling had dug earlier, two meters above the ground—Wang Lun's request. Li Ling didn't know what he was planning, but she didn't want to ask; it couldn't be anything bad, could it?

Seeing that the waterway was finished and it was getting dark, estimating it to be around five or six o'clock, Wang Lun said to Li Ling, "I'll go to the water source first, fill it up, then check the next section of the waterway, and cut some branches. When you see the water coming, take a basket and go to the stream to collect some stones; I'll bring them back later." Li Ling asked疑惑地, "Why collect stones?" Wang Lun said, "You collect them first, you'll find out tonight." Seeing that Wang Lun wouldn't elaborate, Li Ling had no choice but to agree. So Wang Lun took his machete and went out. Li Ling first gathered the dried seafood and wild vegetables into the shelter, then cleared two baskets and placed them beside the earthen pit, quietly waiting for the water to arrive. Sure enough, soon enough, water flowed down the waterway, and seeing the water accurately fall into the earthen pit, Li Ling took her baskets and went to the stream.

Wang Lun, while inspecting the waterway, also cut down some dense bushes along its banks. He stopped after collecting a large bundle and focused on checking the waterway. The journey to the camp was uneventful; after all, considerable effort had been put into constructing the waterway, so its construction was relatively good. Once inside the camp, Wang Lun placed the bushes in the shelter. Seeing that the pit was more than half full of water, he moved the drain outlet to let the water flow directly into the drainage channel before heading out to the stream to find Li Ling.

When Wang Lun found Li Ling, she had already filled one basket and was about to fill the second. Wang Lun had initially intended for Li Ling not to fill it, but thought it would be good for her to participate, and that she might be unhappy if she wasn't allowed to. So he helped her fill it, and after filling most of the basket, Li Ling finally stopped after Wang Lun's repeated persuasion. Then Wang Lun tied the stones in the half-filled basket to Li Ling's back, went to carry the other basket of stones himself, and let Li Ling go ahead, saying she could just collapse by the pond when they reached the campsite.

The two returned to camp, put down their baskets, and Li Ling, exhausted, sat down on a rock. Seeing that it was getting dark, Wang Lun, without resting, quickly grabbed his entrenching tool, jumped into the water pit, and widened it to about two meters. Because of the water, digging was quick; they dug down a little further, about seventy or eighty centimeters, and then stopped. Only then did he ask Li Ling to bring stones. Wang Lun laid stones in the pit, while Li Ling passed them to him. They first found some relatively flat stones to line the bottom, then used other stones to line the surrounding walls. Because of the water, the mud was quite moist, making it easy for the stones to stick. Plus, the stones were stacked one on top of the other, with the larger stones at the bottom, making it quite stable. Wang Lun tried to minimize gaps between the stones; if any were unavoidable, he filled them with small stones. They finished building the water pit as night fell. Wang Lun moved the drain outlet back to the pool. Seeing that some stones remained, he paved the area between the pool and the drainage channel. He also installed an overflow outlet where the drainage channel connected to the pool; only water above this stone would flow out of the pool. It was already dark. Li Ling had prepared dinner, but since water had arrived at the camp, they didn't need to eat so early; they could cook later when it got dark.