Swelling in the hands and feet after drinking a lot of water is something worth paying attention to, because it could be a few different things like water retention, circulation, or something else going on. On one hand, the hot weather does make us want to drink more, and some mild swelling can happen, but on the other hand, if it's happening regularly it is probably not something to just brush off. It might be good to bring this up with a doctor, just to be safe and rule out anything that needs attention.