Unsalted nuts. They store really well. Walnuts in particular have plenty of calories but if you have too many in a day you'll be overloaded on omega-3, which wi

Unsalted nuts. They store really well. Walnuts in particular have plenty of calories but if you have too many in a day you'll be overloaded on omega-3, which will make your hands and feet swell painfully as pressure is applied; the blood vessels in them start breaking too readily. So nuts aren't the bulk of my calories, but they help make everything else taste better.