Theres plenty of little 200ml cartons of orange juice / apple juice that have about 15 g of carbs, all sugar, don't need keeping in the fridge and perfect for treating a hypo.
You don't need anything medical to treat a hypo, you just need fast acting sugar.
Baby food is a good place to look for the pouches/pots of fruit purée. They're usually 15-18g of carbs and don't need refrigerating - a bit more like a smoothie than squash. Anything with banana or tropical fruit in will be have fast acting sugar for good hypo treatment.