Follow the instructions below to have a small, endlessly full pool of water anywhere you want it. Note: You'll need an Iron Bucket and the ability to dig into the floor a little.
1. Dig a 2 by Hole in the ground that is 1 square deep 2. Fill your bucket/s with water from the ocean or a lake. You only need 2 deposits, so taking 2 buckets is recommended. 3. Bring the water back to your base and pour 1 Bucket in each corner of the square in the ground.
If done correctly, you should have a still 2 by 2 pool of water that, every time you take a bucket and use it on any of the squares, the others refill it to fullness.