MCPE Infinite Water
Wall
Make a 5x3 wall
Base
Add 3 blocks to the bottom 3
More Blocks
Add some more on the block diagonally 1 up and out for both sides
More Blocks
Add some more on the edges of the 3
Removal
Remove the bottom 2 and add one in the center then a slab on the one in the center
Water
Fill water in both sides of the hole not in the middle though
Add a Roof
Add a roof
If done correctly the center water block should be regenerative
Just use a bucket on the visible water and it will regenerate