I like to add warm water to the food because for one, it makes me feel nice because it releases aroma and secondly, I think it makes it easier for them to swallow the food. When I just feed kibble dry, they do a lot of extra chewing and hard swallowing and then gorge at the water bowl.  When I add water this avoids the water bowl gorge, which then results in a couple of wet urps- you know, they burp and a puddle comes up with it. Yuk.