It's never a good idea to limit your water intake. Plus, your pee will be more concentrated and will smell worse. It's best to just drink that water.
And being diapered 24/7 means you just have to reprioritize your budget. Diapers for me are more important than even my car payment or utility bills. It isn't a question of if I can afford diapers, it's if I can afford to go eat out or go to the movies.
It does help to make sure you don't overspend on using "cheap" diapers too. As long as you stay under $5.00 per day, you're doing good. For me, that means buying Betterdry for about 1.50 each, and changing only 2-3 times per day. This is where staying hydrated helps so I don't end up stinking or getting rashes.