Preservation > Freezing Freezing
In general, I think freezing is one of the worst ways to preserve food for a shtf situation, unfortunately it seems to be one of the most effective for preserving nutrients and vitamins.
One of the Vitamins we need to worry about is Vitamin C. It is destroyed by most preservation methods, and we need it to be healthy.
Freezing does preserve Vitamin C however.
The problem is how do we keep stuff frozen in a lengthy grid down situation. Electricity would be intermittent (think India) and you couldn't depend on it to keep things safely frozen.
There are special fridges designed for boats to keep stuff frozen for long periods and that require little electricity, so that is one option.
Another would be a trompe. This uses flowing water to compress air. When you release compressed air, you generate cold. Could this keep frozen stuff cold, especially during the winter, when you really need it? On the other hand, will a trompe run in Canadian winters, or would it just freeze up?
Keywords: Freezing Foods | Food Preservation | trompe