bacterial growth rates in drinking water?

Question

I am doing a science project. After taking a sip of water from a water bottle and putting the bottle in the refrigerator, after how many days does the water become unsafe to drink? Is there a certain site that could help me, because all I have found are sites relating to something about bacteria on the surface.
I would much appreciate as much help as possible!

Answer 1

So it's bottled water, and it's refrigerated, right. Refrigerated means between 35-45degrees, OK.The water will be safe for drinking forever.

Answer 2

You cannot get bacteria growth in water unless there is added something to feed the bacteria. Impurities in the water that would feed bacteria are nitrates, sulfates and sugars for instance.

Add sugar to the water and let it desolve, it will still be clear.

There are always a few free bateria floating around usually enough to seed your scientific experiment.

Put the bottle on the shelf and in a day or two or so it will turn a bit cloudy then more cloudy from bacteria growing in the bottle. The bacteria will need oxygen so adjetate it periodicly.

Use the change in the amount of cloudyness to estimate how long it takes for the bacteria to double in number.

Try to use your eye to tell how long it takes to go from from "light" cloudyness to more opaque cloudyness: When its about twice as cloudy then the number of bacteria doubled.

Then you know the doubling time, and you can tell the growth rate of the bacteria.

Answer 3

Considering that there no nutriants in the water and it is being kept at about 40F, I would expect it to remain safe to drink almost forever, despite the small amount of bacteria applied by your lips to the outside of the bottle. Even if you sucked water into your mouth and spit some back into the bottle, pretty much the same applies. Bacteria does not grow in partly used water bottles that I have left in very warm garages where I store my bike.

Answer 4

There are quite a few varieties of bottled water that must be seen to verify your loved ones gets actual purified water. The national Sanitation commencing up is the placement to examine for the excellent water. i want to advise between the manufacturers on their checklist stated as appropriate Water. it quite is what i exploit and that i've got faith beneficial that i'm no longer eating contaminants.

Answer 5

There are too many parameters in your experiment. Since the growth of bacteria depends mainly on them you can get any results.