I love Berlitz pocket guides. They are very comprehensive, written in a warm and friendly manner, easy to read. Not mentioning that their pocket size makes it very easy to carry them around! This one is no exception: friendly, detailed and packed with useful information.Captivating reading.
Information about poor quality of the drinking water on Tenerife is on the page 13 under "Ecology" and on the same page there is a recommendation to use bottled water for drinking. So it would be fairer if prior to writing review readers would actually read these guides beyond indexes...