I would only be doing this short term, until I could do my own pond. I have a lot of other things I have to finish before I do that, which is why i thought about doing the hauling. I know the down sides to it, but the up-sides are seat time, getting to buy a tank and getting to buy a pump and the goodies that I'd need to go with it!
I'm not sure what kind of grass I have but I plan on overseeding with something a bit more robust. I think my issue is a combination of several different things that I need to resolve, not just lack of water. Of course right now water is plentiful...