Hello,
As the title suggets I'm after a water jug or water dispenser for under $100.
Because my current source of water is either a tap in small bathroom near a toilet or a kitchen tap* shared with students but judging at the state of the kitchen the bathroom tap is safest.
*The kitchen is in such a state the tap is growing mold.
If the kitchen tap growing mould, I think you should clean the kitchen with bleach.
Tap water is very safe to drink.
If you're concerned, boiled water is better than a cheap water filter.