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A slice of any citrus in water keeps it from being so boring. Most of the flavor come from the oils in the peel, so drop that in. I’m particularly fond of orange. A sprig mint is nice, toon. Crush it a little before you drop it in.
There are a gazillion kinds of herbal teas. Drink them hot or add a bag or 2 to the bags you use to make iced tea. I find 1 bag of a chai with 3 bags of Red Rose in a half gallon of water delightful.
There’s not a lot you can do to doctor black coffee. I used to have a friend who would give a shake of cinnamon to the grounds before she made it.
You can spruce up your flat water with a squeeze of lemon, lime, or orange. You can drink flavored sparkling water. You can also drink black coffee and black or herbal tea. Cinnamon can help if you find those too bland.