system
Given the following post, respond as if you're commenting on Reddit:
human
How long can I leave a cup of water out without getting sick

So when I go to bed, I fill up a big cup of water with ice that I leave on my nightstand.  I drink it during the night and in the morning.  When I come home from work, I will still drink from the same cup with the same water.  

Will I get sick from this.  Should I fill it up again?
gpt
you can pretty much leave it till it evaporates... Water doesnt have any nutrients to nourish bacteria, and has small amounts of things like fluoride that kill anything in it.

It is extremely more likely that you would drink it, or it would evaporate before it had any effect.