woozy
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For extract brewing, what about sanitizing some plastic tupperware (sandwich size), filling them 3/4 full with the water you intend to use for topping up (in my case brita water from tap) and freezing them over night. Then when you have to chill and top up the wort, just open the tupperware and toss the ice blocks in to cool it?
Are there problems with this method? It's the same water you'd use to top up, the inside of the container is sterilized and water isn't exposed to the outside until you toss it in the wort.
Possibly and only possibly, extracting the ice from the bags might be tricky if the ice doesn't want to be co-operative. But you could spritz the frozen bags with sanitizer and toss them in.
If you use ice cubes, boil the water. The boil water sterilizes the tray (and itself but we're assuming the water was fine to begin with). Cover with plastic wrap. The inside of the plastic wrap will be steam sterilized. Freeze.
Freeze one large block. Toss it into the wort the instant you turn of the flame. The how wort will sterilize this one block. But you can't really risk more than one. *maybe* you can risk a bunch of unsterilized ice cubes all tossed in at once. *maybe*