If I feel like getting fancy, I just throw things into a jug of water like lemon, lime, cucumber, raspberries, blueberries, blackberries, mint, ginger. Never made kombucha though, nor do I drink vinegar, however, I do have some raspberry vinegar that's really good in sparkling water (but there's clearly too much sugar in it as it jacks up my blood glucose, it's from some small batch company with no nutritional info or ingredients provided).

When I take ACV I just add some water and salt and take it as a shot. Not as something to drink.

I mostly drink coffee, tea and sparkling water. If I'm in the mood for something else I like the stevia sweetened water flavorings or I'll add some lemon, lime or other fruit to the water. I do that more in the summer it seems.