I use the small boxes of juice, with attached straw, not the easiest thing to carry round when running or walking, stuck one in pocket of husband’s jacket last week when we were going to a pantomime. The problem with those is that you often get a nice sticky fountain when you insert the straw.
Am also able to buy pouches of extended-life pouches of baby food, yoghurt with fruit , which amount to about 10-15 grams of carb and seem to act quickly enough for me.
I stash sachets of sugar and sugar cubes from cafes in my jacket pockets and have used those in the past. I have repurposed a small lidded dessert carton to keep jelly babies in, think someone did some research and jelly babies worked out the cheapest form of ‘rescue remedies’.
Am also able to get on prescription something called baqsimi, for the time when I don’t give myself some sugar in time.