This is a list of everything (in most situations) that you will need to foster kittens.
Towels, blankets, or sheets
Carrier of the proper size
Toys
Amazon boxes
Scratching boxes
Feather wands
Grooming supplies
Brush
Nail trimmers
Cat shampoo
Food (wet for kittens)
Water source
Litter Box and Cat Litter
Karo Syrup
Antibacterial Neosporin - no pain relief
Collar or Microchip
Leash and Harness
Treats
Food Bowls
Cleaning Supplies