Okay, so, soaking the kibble overnight in water, adding a spoonful of topper, more water, should work. What foods did he say were okay? Let’s see the list.
Check Nutrisca and Salmon and Chickpea http://www.chewy.com/dog/dogswell-nutrisca-grain-free-salmon/dp/35031
If your vet is recommending prescription food, I would go along with it for now at least until the dog is stable, then discuss options.
Per the search engine here: Check out my posts. /forums/search/bladder+stones/
PS: Take the dogs out frequently for bathroom breaks, opportunities to urinate. Keep the bladder flushed, stagnant conditions in the bladder are conducive to struvite and calcium oxalate development.
