I know up here if you have trouble with rehydration call a rescue. Go to petfinders.com and put in your zip code. They have bags of a mixture of water and I think saline and vitamins. They put the fluid under the skin and it makes the kittens look like little buffalos. In the mean time use your little finger and dip it in the formula or wet kitten food and gently scrape it on their teeth. They can crash fast without fluids.