Just water for me. I keep a cup and a big jug of water next to me at all times while at home (otherwise I always have a water bottle on me). I don't know how to make coffee so it doesn't taste terrible. Though caffeine simply doesn't work on me anyway (damned body chemistry), so I definitely don't feel the need to drink it if I'm not getting any of the benefits. Also I really hate how it makes me smell (especially when I go to the bathroom... like how do people stand that? - and on that topic, how it acts as a laxative is pretty annoying), days after drinking just one cup and my body still smells like the coffee, so gross. Occasionally I get really into tea, but the need to constantly go to the bathroom gets annoying really quickly. Also, like coffee, doesn't leave a good taste in your mouth (really promotes good habits with brushing your teeth, lol). As for alcohol: I would love to get into casual drinking but just haven't been able to yet. Beer for me is definitely an acquired taste, and currently I haven't been able to work up to drinking more than half a can (literally every sip causes me to gag). Liqueur doesn't bother me so much, but I reserve that for parties (I tried drinking a gin and tonic yesterday at home but didn't find it very good, I definitely need to be around friends for that type of stuff). I think sometime in the next month I'll start (force) drinking a can of beer per day so I can work up the taste for it.
In my experience with drinking beer, forcing yourself to drink it so you'll like it is not the best way to go. If you really want to see if you like beer, see if you can find some place that does tasting flights. This is a good way to try small amounts of many different beers to see if you can find something you actually enjoy. I don't know where you are located but a bar near me called World of Beer (which is a chain) will generally let you sample things before you buy a glass. Many other bars that specialize in a wide selection of beers will often do the same. Another option is to visit breweries if there are any near you as they often will have tasting samples at the end. Lastly, you shouldn't feel pressured to like beer just because others do. If it's not for you, it's not for you. I know some people who just absolutely can't stand beer, and that is totally ok. You should drink what you like, not what other people expect you to drink. Good luck with finding something you like and remember, if you don't like beer, that's ok!