I'm working on putting together our 72-hour kits. For the food, I made each of us 3 gallon Ziploc bags. Each bag has 3 meals and some snacks. There are not a ton of calories here, and extra water is required, but it's certainly better than nothing. Maybe I need to throw in a few extra Clif bars. I'm going to try for 3 16 oz bottles in each backpack itself. Here's the menu I used for our 72-hour kits.
Breakfast Day 1
oatmeal
Instant Breakfast
fruit cup
Lunch Day 1
Easy Mac
V8
Dinner Day 1
soup
Crystal Lite
Snacks
granola bar
pudding cup
hard candy
Breakfast Day 2
Poptarts
applesauce
chocolate milk
Lunch Day 2
peanut butter
crackers
fruit snacks
Dinner Day 2
ramen
juice box
Snacks
almonds
Clif bar
hard candy
Breakfast Day 3
breakfast on the go
fruit snack
juice box
Lunch Day 3
ravioli
raisins
Dinner Day 3
peanut butter
crackers
Crystal Lite
Snacks
granola bar
pudding cup
hard candy