Why? I’m trying to understand a process where you would need to “top off” after the boil and if that process exists, why you would need to store that water in your fermenter?
I know BeerSmith software allows for “top off” — and I have read several posts on the BS Forum about it — but if the Equipment Profile is correct, there should be no need to top off after the boil. Further, I would be nervous adding additional water to my fermenter that has not been boiled first.
If additional water is needed for some reason, why not add it before the boil so that water can get sanitized?
Many extract brewers do a partial boil, then top off to get their full volume. If you're a stove top brewer, then that's probably the only way to brew a 5 gallon batch.
To the OP, you can probably store the top off water in the fermenter and be fine if you sanitized it first, but make sure it is sealed tight so no bacteria can get in. Water has no antibacterial properties to prevent bugs from growing the way beer does.
When I was brewing partial-boil extract, I would store my topoff water in the fridge to help chill my wort down to pitching temps more quickly.
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