Long ago I used to keep a few cans of high energy roasted spanish peanuts in my rig. A few years back I switched to Pemmican balls which don't freeze. Now that I am here in Florida, I keep a couple snack bars in the glove box.

For drinks, I always just carried water with me, up to a couple gallons at one time, but now only a couple 20 oz bottles unless I am on a sojourn (work is less than 5 miles from the house, 3 miles as the crow flies).

In harsh cold environments, I would stick with the pemmican balls, and pack water adulterated with sugar, salt, potassium chloride, and a few other ingredients to get the eutectic temp way down. I've made concoctions that weren't excessively salted (I'd consider them as healthy nutrient supplements in fact)that wouldn't freeze above 0 degrees.
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The ultimate result of shielding men from the effects of folly is to fill the world with fools.
-- Herbert Spencer, English Philosopher (1820-1903)