Poo help

Ma

Ao my son is 8 months now. Ever sice I started solids (fruit/veggie puree) with him he has been basically nonstop constipated or close to it.

I cant seem to get it all right. I try giving him extra water but he hateeeees water 😑🙄

Suggestions on how to get this all normal and not make him stopped up anytime I give him something??