Hey there. I think there are some water change stations within various tank builds on the forum (keins, dez, "project mayhem" that I can think of). I like to keep enough water mixed for a 25% water change at all times
(then again my water changing station is a brute bin on wheels lol), but I know that some like to keep up to a 50% supply which for some large tanks makes logistics hard.
As far as the winter thing- I'm sure that if you keep the water circulating in the tanks you wont have a problem (even with RODI unless it gets very cold) but the lines to and from the tanks would be another matter. It might end up being better to look at heating the garage to keep it just above freezing.
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