One of the most important things you can do to maintain good health when travelling or out and about is to wash your hands regularly and well.
That's often easier said than done though if there isn't any soap - and sometimes there isn't even any water! Hence it's best to go prepared - and a potion or lotion that doesn't require any added water could prove to be invaluable.
Advantages - no added water required; quick and easy to use; evaporates after use leaving your skin feeling clean and dry; good antiseptic properties; handy, pocket sized bottles and wipes.
Disadvantages - not particularly good at cleaning/removing dirt and grime; can leave skin feeling dry if used regularly - although this effect can be reduced by the addition of Aloe Vera.