Oral rehydration salts store well and are easy to carry for travel. Kids (and adults) get stomach viruses, and having these at hand to mix with water make giving clear fluids quick and easy. Lots of manufacturers market and sell these products, and I don’t endorse any specific brand. I recommend tucking them in the carry on when heading overseas–especially for those long flights home in case adventurous eating gets the best of you.
If you are planning an overseas adventure, give the office a call to set up a travel medicine appointment.