Help me moms

My 9m old doesn’t drink water no matter what I do , how I try. I have tried Sippy cups, his bottles, straw, glasses , glasses with straw ...

Having said that it’s very hot where we live (36deg-39deg) for the past 3 days & my baby goes no water . So obviously body is heated up/ dehydrated & he has been crying every time he pees . And it’s only droplets 💧poor thing , he hugs me tight every time he wants to pee . Then after a 5min interval his willy swells up & he pees a lot Mostly on me (it’s very very hot) .

Looks like it’s UTI or beginning stages ; while we will be only able to go to a doc in the morning , anything else that can be done at home to help him other than feeding him more water coz that clearly isn’t happening with my bub.

Also even after he has finished peeing, Willy still looks swollen a bit & pinkish not skin colour- what’s that supposed to mean ? I am scared .