Antiseptic, mercurochrome and antibiotic powder or similar 'dry' spray - for cuts and grazes. Calamine lotion - to ease irritation from bites or stings. Scissors, tweezers and a thermometer. Insect repellent, sun block, suntan lotion, chapsticks and water-purification tablets. To make yourself an expert on health aspects of Nepal would not only be difficult but also troub1esome.
Common sense can often save lives.
The number one rule is don't consume the water including ice. Reputable brands of bottled water or soft drinks are generally fine. Take care with fruit juice, particularly if water may have been added. Tea or coffee should also be OK since the water would have been boiled. Salads and fruit should be washed with purified water or peeled where possible.