Is it safe to drink out of a Windex bottle?

Answer 1

If you drink the cleaning product that comes in the bottle, then no.

However, cleaning out the empty bottle with dish soap and water thoroughly and refilling it with another substance, for instance, water or blue Gatorade, then it should be safe. Still, your drink may taste slightly like the cleaning product due to chemical residue being left inside the bottle. There will not be nearly enough residue to actually cause any harmful side-effects, though.