Part of the “eight glasses of water per day” story is that we are all chronically dehydrated, and yet our bodies are not sensitive enough to correct this by making us thirsty. From a physiological point of view, this is rubbish. Drink water. Some. Do you need 8 x 8oz (1.9l) per day? No. Include tea and coffee in your consumption figures. But do not drink sweetened sugar beverages. (SSB). That means avoid gin and tonic, rum and coke or any alcohol with SSB’s. Change to Just do it on the rocks.