PLEASE! Call your vet and tell the appointment making receptionist that you have an EMERGENCY and cannot wait until the 17th. Insist that they find an opening for your little kitten for today or tomorrow at the very latest! If they won't/can't, call another vet and see if there is a 24 hour emergency vet in your area.
You can force the baby to drink more water with an eye dropper. Push the tip very carefully into the side of his or her mouth and squeeze the rubber tip one drop at a time. Is the kitten pooping and peeing? If not, warm a cloth and rub the kitten's genitals very softly to encourage excretion.
#PetHealthandNutrition