I've recently stopped drinking, after several years of more than I should. It wasn't out of control, but I didn't like the hangovers, and I knew I was a bit more stupid after I'd had a pint. It transformed my sleep.
I notice some of the non-alcoholic beers I'm experimenting with now are actually called "isotonic drinks" - I always associate that with that awful Lucozade stuff.
Water for me. I don't drink as much as I should but I really notice when I'm drinking as much water as I need - I have so much more energy!
Oh, and Robinsons has brought out a really nice cordial made with lime and mint. Try it!