Our Homestead

You can also bake cookies in big batches and freeze them.
I am currently looking into freeze drying things, not sure yet how to do that though.
Also, always IQF your items in the freezer (IQF = Individually Quick Frozen) that way you don't need to thaw out more than you need.

When you have a lot of food in the freezer or when you have more than one freezer, it might be a good idea to have a generator in case the power goes out for an extended amount of time.
I also want to add here that you can pretty much freeze anything and everything. I can't think of too many things that cannot be frozen.
Milk, however, will be fine for a month or two in the freezer but I've noticed that if you keep it in the freezer for longer than that, it starts to curdle.

I'd like to add to this.. 

Shop in bulk. 
When something is on sale and it is something that can be frozen, you could buy a bunch of it, and then freeze it.

Bake 4 loaves of bread at once to save electricity or gas with the oven. 
Bread freezes really well.
I cut my bread in portions, like what I'll use in one meal, I then put it in freezer bags, and freeze it. It comes back as good as fresh.

I know, freezers use electricity, but they will save you money in the long run.

One of the best ways to save is to buy things in bulk (meat for example) when it's on sale, and freeze it.

Make your own ice cubes!

Freeze leftovers from meals to make soup with later.

Buy frozen fish instead of fresh, it's always cheaper.

Make meals in bulk (saves on gas or electric when cooking), portion and freeze them.