Hard plastic rolls of glucose tablets from Wal Greens.

a friend bought 6 testers (some came with valid strips) from flea markets and thrift stores. He got them over about a year. Theyall take the same strips as his and he has them in all kits and at the house.

My grandfather used to work on trains with a guy who would lapse suddenly. He carried packets of grape jelly for him. Easier to swallow in a pinch than dry tablets.