water, because I can take regular sips without taste lingering in my mouth(or destroying my teeth). also, water is just awesome.
coffee, once in the afternoon, or sometimes in the early evening(11 at night can still be considered early in the eveniong sometimes). I also like tea, but I only started drinking tea this summer, and I don't have a usual moment for it like coffee, sometimes I drink a lot of tea and then I drink none for weeks.
sometimes in the evening something sweet, juice or lemonade. or sometimes whisky.
but water is always the baseline, no matter what other drink I have I also have water within arms reach