Make sure you take enough time to get used to the climate, local cuisine and the atmosphere in Egypt. Stomach problems are often the result of a mix of fatigue, climate and unfamiliar food. It is important to drink plenty of water and juice because of the heat. Hot drinks such as tea are better than cold drinks. Drink only bottled mineral water, which is widely available. Anti-bacterial hand hygiene gel is very useful for washing your hands when there is not water available.