Search this site for boondocking, you will find you don't have to live without much (if anything) just because there's no hookups.
Some people will cut back to minimal, and rough it, other get elaborate with battery banks, solar panels, and 12 to 120 volt power inverters to power their microwaves and hair driers, other still will opt for a quiet inverter generator and run like they were at a full hookup site.
When we state park camp without hookups, we opt for the first option, go minimal, TT lights switched to LED to save battery power, moderate water use (due to small tank, and power use of pump), vent fan at night to keep air moving, following all this on our stock single group 24 battery we can go a bit more than 2 days. If we spent a bit and beefed up our battery bank with a pair of 6 Volt GC1 (golf cart) batteries wired in series (to provide 12v), I imagine we would have the power for nearly a week.