I’ve read that plastic water bottles - of the 1 gallon jug type - aren’t meant for re-use, and that chemicals from the plastic can leach into the water.
Is there any truth to that?
If so, what chemical is the concern over? What physiological effects does it have and what dangers does it pose?
How is the original use of the bottle okay, but re-uses pose danger?
Do whatever undesirable things in the water sink to the bottom? I’ve noticed that the last 10% or so of refilled water bottles can have an unpleasant taste.