How much bacteria growth occurs in reused water bottles?

for a friend do science fair project please help

I have recently been placed on the Night Shift as all of my auditors have left and I will be doing this for a month. I want to drink water while on this shift, but water can be bland, especially for extended periods. With that said, I wanted to prepack...

I've found (empty) ornate bottles to put holy water in, as well as tiny, tiny little glass bottles (4oz) of holy water, which aren't really sanitized or sealed to prevent bacteria growth. Plus they're expensive. I'm just looking for machine-sealed plastic...

Question 1-How much bacteria growth occurs in reused water bottles? Question 2-Where are bacteria most present in a household? I need independent and dependent variables and constants

ok well my sciene fair is in an january and i need help. I am going to do " how much bacteria growth occurs in reused water bottles" but i dont know where to begin with it. Can someone help in any way. Thank you.

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...Nitrafying bacteria in a New fish tank? I have been going for about a month but want to be certain of GOOD bacteria growth in my tank. I have alrady done my preliminaryies . I have kickstarted with an old filter added to my new tank from an already...