What can I do to help my 8 week old kitten feel better, cant get into vet until tomorrow morning :(?

Wipe any goo from your kitten's eye with a damp tissue. The goo tends to irritate the eye and make it sore. Just wipe it gently once or twice a day. My vet told me this many years ago. You could put a pot of water on the stove for tea and this would humidify the air a bit for the kitten. I am sure he will be okay if he is eating and drinking and eliminating .