Probably depends alot on your location. For example, east Texas has alot of streams, and finding water is not all that difficult. Of course that would change if you were in west Texas. So if you lived in a location with easy to find and many sources of water, you might drink oftern. If not, you'd probably have to take what you can get when you can get it.
But I'm with Lex on this one. The body has a wonderful mechanism to let you know when it's time to drink, it's called thirst. Also, think about it - yes water will temporarily dilute stomach acid, but, and this is a guess here, won't it just quickly transpire out of your stomach into the blood stream and surrounding organs? (Just like alcohol passes straight to the blood too)? So it might delay digestion for a couple minutes, but unless you're chugging inordinate amounts of water, shouldn't be much of a problem. But I don't understand the bio-chem there, so it's mostly a guess.