The water we get here in Qatar is sea water as the number of wells and ground water is less. Sea water is taken and purified with a process called Desalination which separates salt and minerals from water and then chemically treated and supplied but in some areas chemicals are dozed in again, so the houses near by the dozing plant will have high content of chemicals esp chlorine and all know chlorine is super bad for hair. so use a carbon filter which removes chlorine and other chemicals from water. 


Some tips that i can give


* Fix a carbon filter or wash hair with a cup of pure mineral drinking water after bath


* never take bath in HOT water


* protect ur hair from direct SUN


* also eat fruits and vegetables


* have a balance diet