Dextro tablets good. No need to keep cold, long dates on them and easy to carry in a pocket like a big packet of gum. Just down side is the chalky kind of taste for me. Orange flavour available in ASDA but lime and blackcurrent flavours available in TESCO. You just need to find out what works...
Well i am kind of lucky and work in a convenience store so just grab the safe bet of lucozade. Sandwich or a pasta bowl to help keep levels steady afterwards. Keep jelly babies for a quick boost in a sandwich bag when out and about in town. Never keep a whole bag with me cause i will eat them...