My cats are very fussy about drinking and will only have it from stagnant puddles, running taps ( not feasible in these water shortages) or the toilet! However I have discovered that if you put a glass full of tap water in the bowl and stir in a couple of teaspoons of tinned tuna they will lap up all the fishy water. Sounds disgusting to me but its a cheap way of getting them to drink more without investing in cat broth or soup.