No matter how bumpy you make a texture, it wont change the outline of the object, bumpmapping is not built to work that way. 
 You could model a flow of water with metaballs, but its a difficult thing to achieve a realistic look... and it wont render very quickly.

(_/)
(='.'=)
(")(")This is Bunny. Copy and paste bunny into your signature to help him gain world domination.