There are a lot of reasons that you'll want to have a Bucket of Water on your 
hands (fire, building, farming, irritating friends, making a moat, etc.), but 
it can get really irritating having to run down to the ocean every tie you want
some. Follow this quick tutorial, and you can have a small, endlessly full pool
of water wherever you want it!
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. Every time 
you take a bucket and use it on any of the squares, the others refill it to 
fullness.