Those water flavor squirts, mio or crystal light type stuff. I’ll drink plain water over just about everything else (egg nog is the weakness and exception right now…), but the various lemonades or fruit flavors are always nice to have around. I wouldn’t be surprised if something in their composition is not good for you.

A slightly more titillating answer would be lube. You’re putting something on a mucous membrane, and it’s almost guaranteed that some will be absorbed or ingested.

No, no! Listen to the shamers! Change your distro eight times over the first month as you listen to them whine, and eventually return to the first one you chose, full of wisdom of why those other distros suck so you can tell the noobs who choose one of them first instead of your glorious choice!