If in doubt about fresh drinking water -stick to local bottled mineral water. Follow the southern custom of taking a siesta after lunch in summer weather, otherwise you will find yourself exhausted by dinnertime. Pack a towel in your bag. It is useful when travelling by train, or for an unexpected bath. Pack also a light rug or ground sheet for it is often useful on a beach.
Sweets are often expensive abroad.
So take your requirements. Glucose sweets are excellent should you get tired 17. Find out the postage rates for postcards bearing only five words of greeting. Often there is a big saving. Take earplugs with you, for in many foreign cities and resorts the outside noise can otherwise rob you of sleep.