Hi, I would like to know after the bottles are sterilized, should we keep them in the water itself or should it be kept outside?

I would wipe with clean cloth and keep in closed vessel

Wipe it and keep outside.

First of all I would request you to avoid bottle feeding but in very hard circumstances if you are left with no other option than bottle feeding you boil or as you wrote sterlize it as many times as you feed the child and thenafter put the cap over the nipple of the bottle.
Once again I would strictly emphasise to avoid bottle feeding.

You can keep it outside. Or store in a closed in an airtight container

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