You'll need more food and water than you think.

[Skean Dhude]

I've calculated my food based on the contents. Tin of peas, potatoes, sweetcorn, meat is a meal for 4 at the minimum plus some pud. Living well. Reduce that and make it last two days, perhaps add in some carrots as well. My calculations are based on meals like that. Sadly, I have a set of similar meals which I can mix and match.

I've tried out the meals but filling the pantry and then just using the tins and we made it last two months. In the end though we topped up some of the veg tins so I had to suppliment my veg stores with some more. It's the only way to learn. test your theories.

So some days will have had more calories than others.