Can the mold from a water bottle harm you?

[water_drinker]

I always use bleach in mine, and then I squirt it through the lid to clean the mouth piece and everything to.

Beach evaporates so once you let it sit a bit after rinsing it the bleach smell and all will disapate.

Only the water in the bleach evaporates - the sodium hypochlorite remains as a residue salt (try evaporating a small puddle of bleach - you'll see a white residue left behind)...it's this residue that can be harmful when ingested. It's always best to rinse thoroughly after treating with bleach.