Vinegar is an acid, so it tastes sour. Ditto citrus fruits.
Bases taste bitter and feel slippery.
Human bodies are usually capable of dealing with quite a lot of acid or base coming in through the digestive system. I really don't know what sort of "risk" you're talking about.
Thanks for the vocabulary fix. As for the risk, google for the effects of too much acidic drinking to teeth and esophagus. People remove deep rust from iron using vinegar, I'd rather don't underestimate it myself.
Bases taste bitter and feel slippery.
Human bodies are usually capable of dealing with quite a lot of acid or base coming in through the digestive system. I really don't know what sort of "risk" you're talking about.