Beware of major rivers running the lengths of valleys and draining a large area. It is safer to drink from small creeks running down the sides of valleys. Rain water supplies at huts are safe. If in doubt then purify, boil or filter the water. Never, ever defecate near rivers - always use hut toilets or dig a latrine at least 50 metres from any water source.
Amoebic meningitis inhabits many thermal pools.
This is a very serious disease, but you are perfectly safe if you keep your head above the water. Hypothermia Or exposure. This is a drop in core body temperature, a life-threatening condition. Causes include inadequate protection from cold, wind and rain, immersion in water, lack of food, exhaustion and errors in judgement. Symptoms are lack of co-ordination and sluggish pace, confusion, lack of alertness, and lack of response to the cold.