You should always take the precaution of packing a first-aid kit when travelling with kids. Essential items would include bandages, plasters, antibacterial wash, antibacterial wipes, antiseptic cream, pain relief, sting and bite relief, antihistamine, treatment for sunburn, eye drops to treat sand in the eyes and so on; for travel in today's post pandemic world, pack some facemasks for the family too. If a family member develops diarrhoea and you don't have access to readymade rehydration powder, you could prepare your own by mixing six teaspoons of sugar and a half-teaspoon of salt in a litre of drinkable clean water.