He used to drink quite a lot, but suddenly stopped using the bottle. I bought a new one, but to no avail. Now I just give him water in a bowl,he drinks from it, but sometimes kicks it and his cage gets wet and the water contaminated. He does not drink as much as he used to. I am worried. Please, advise.
Provide both so he has a choice. If he wants it he will take it and at least he has a clean source all the time if he does contaminate the bowl. If you think he is unwell for any reason then best see the vet for a check over.