You must be very careful with water quality not only for drinking but also for showering and cooking. One of the few problems is legionella but there are also ear and eye infections and skin irritations. Why risk your families health!
Legionella live within amoebae in the natural environment. Legionella species are the causative agent of the human Legionnaires' disease and the lesser form, Pontiac fever. Legionella transmission is via aerosols — the inhalation of mist droplets containing the bacteria(via showering). Common sources include cooling towers, swimming pools (especially in scandinavian countries and other countries such as Northern Ireland), domestic hot-water systems, fountains, and similar disseminators that tap into a public water supply. Natural sources of Legionella include freshwater ponds and creeks. Chlorine is only a short term help and must be monitored closely.

It is far better to get a water purification system like we have  which is chemical free and doesn´t use electric plus no maintenance. Just install it and forget about it! It even makes river water safe not only to shower but to drink!

See www.purewaterspain.com for more details where you can have a system for your entire water supply or a smaller one for under the sink.