I plan to get those microwave disk things for my insulated bowls
, when I've saved up enough money to make a couple of them.
Dunno if I could really set up crates or anything too fancy. My landlord is barely tolerating what I do now (which is leaving food out to attract "all those d*mn cats"). I always bring fresh, warm water - at least a gallon, because sometimes I need to rinse out the bowl as the raccoons come out when it's warmer to use them to wash junk in!
When I feed, usually Disco and Zinny are always scrambling to get food. They stayed in my house for a month a couple months ago to recover from spaying (and I was kind of hoping to tame them enough to get them adopted out, but couldn't before I had to "kick them out" again). Ever so often their mother and another cat or two will be hiding nearby and eat as soon as they think I'm not too close anymore (several yards, and mostly blocked by sight from bushes).
I still have this set-up, only with clear storage tubs (the bag-covered boxes got all soggy and collapsed). Maybe I should drape a black garbage bag over them, to collect heat? I do want to make a small draping/curtain just over the rim of the tubs anyway, as snow keeps blowing in. I figure I'd have it hang over just low enough the cats could slip in under it to eat.
I guess I really shouldn't worry too much. They survived last winter (well, except Disco and Zinny, their first winter now) without my help. I guess whatever I give is better than not having anything at all, and they can take it or leave it.