Bottomless Bucket!
After driving for a while, the truck reached the seabed where two of Azarex's undead were standing there. Azarex had given them a simple command to stand there and notify him when anyone approached the boat. Due to the command not being that complex, Azarex could leave them there, and he could go with Dhruv.
After reaching the seabed, all the members got out of the trucks and began to form a line in front of Dhruv awaiting new orders.
Dhruv looked at the group and said, "You can go and board that boat under the guidance of Navi, while I will come back after filling the water for us." he didn't give a clear order because he didn't feel like there was a need for one.
Listening to his order, everyone nodded and began to follow Navi, who was ahead of everyone and was going toward the boat. While they were doing that, Dhruv turned around, and with the help of the trio, he began to search for any river from which he could fill the water.