Ketchup packages. When I lived in Colorado, dad and I would never hit "the hills" without several small packets of ketchup stuffed in our packets and pockets. Would eat them off and on all day. Kept cramps and fatigue away. Cut down on thirst too so we would schedule water drinking stops. (Dehydration in the mountains is a bad idea.) Myself I would also carry a large baggie of cashews/m&m's.
Here in Missouri where I hunt from an elevated stand I've had everything under the sun in the blind with me. Always bottles of water though, with accompanying jug.😉
