And a solar oven. The ability to simply boil water with no fuel whatsoever is priceless.
If I didn't have a pool (and/or a few hundred gallons of captured rainwater) and enough chlorine to purify my drinking water for the rest of my life (one way or the other?), I'd build a little still to boil water in and capture the steam
Different strokes... I live in the woods. heat ain't more than a pickup load of wood away, And I have never lived anywhere without a creek out back... And the creek here is clear water. When the power goes out, I have a yoke to carry 2 fives, and I can walk 20 gallons up here in about 10 minutes. I can drink it like it is in a pinch, but I have steel fives here to boil with out on the fire pit.
So what you have as problems, aren't a problem at all for me.
But it's all good. The thing is to think about the things you need where you're at. I'd imagine desert folks have different concerns from swamp folks, where it's different from the plains, and that different from up here.
Whatever it is, if you need to secure three months of it, bare minimum, it better get done.
I've seen those solar ovens, but they are pretty much a novelty up here. They work good in the summer, but in the winter, you'd starve waiting for sun...