Here are some products that we recommend getting for your kitten:

Microchip Registration: AKC Reunite
Health Insurance: HealthyPaws

Cat Carrier
SturdiBag (Large size) for airline Travel 
AND/OR
Petmate Sky Kennel for road trip or cargo shipping in the future (we don't cargo ship our kittens)
It’s important to also have the airline secure the kennel door with cable ties. Make sure that the crate is properly assembled. Use crate hardware to fasten the upper and lower halves of the crate and zip ties each corner.

Food, Treats, and Supplements
Water: Purified Bottle water from Costco/Sam's Club will do.
Raw: Texas Tripe Chicken Blend, Chicken Pork Salmon etc. Please refer to the handbook for 
Freeze Dried: Stella & Chewy's Freezed-Dried Cat Food
Treats: Freeze-Dried Treats, Fresh is Best etc.
Vitamins & Supplements: iherb supplement list, Multivitamin etc.

Bowls & Feeders
Lepet Raised Pet Feeder, Necoichi Raised Cat Food Bowl, ViviPet, PawNosh, etc. 
Stainless Steel Water Fountain, Ceramic Water Fountain, etc.

Litter and Accessories
Non-Clumping Litters: Tractor Supply Pine Pellet Stall Bedding, Feline Pine Original Cat Litter, etc.
DIY Litter Boxes for Non-Clumping Litter: IKEA BOAXEL Mesh Basket and a Storage Box
Litter Scoop:  Ikea Cat litter scoop, etc.
Litter mat: Lepet Cat Litter Mat etc.
Deodorizers & Accessories: Arm & Hammer Litter Cat Litter Deodorizer Spray, Arm & Hammer Litter Cat Litter Deodorizer Powder, Litter Genie Plus Cat Litter Disposal System, Litter Mat, etc.
Litter Box Liners: Jumbo Litter Box Liners etc.
Automatic Litter Box: Litter-Robot III Open Air with Connect ($25 off when you order through the link, it works with clumping litters ONLY) + Fence + Costco/Sam's 10-Gallon Wastebasket Liners

Toys
Springs Cat Toy, Cat Dancer, Go Cat, Bergan Star Chaser Turbo Scratcher + Bergan Scratcher Cat Grooming Arch, Catit Design Senses Circuit + Motion Activated Illuminated Balls, Yeowww! Catnip Yellow Banana, OurPets Catnip 24 Karat Cat Toy, etc.

Grooming Tools
Comb: Chris Christensen #000 Fine/Coarse Buttercomb (Must have), Chris Christensen Wood Pin Brush #A040(optional), Mat Zapper (optional, only for mats) etc. 
Shampoo: Chris Christensen, Jerob, Davis, ISB, Les Poochs Vitamin Shampoo (Female) etc.
Nail Clipper: Human Nail Clipper works just fine
For ears: ear cleanser or a mixture of white vinegar and rubbing alcohol (1:3).
First Aid: Vetericyn, Styptic Powder

Flea and Heartworm Prevention 
Revolution Cat (It's from Australia at a better price and no prescription needed)

Others
Cat Trees: Local Cat Shows / Sam's Club / Costco / Homegoods / Pet Supplies Plus Cat Trees, Armarkat, Vesper, Molly and Friends, The Refined Feline, Kitty Mansions, New Cat Condos, K&H Pet Products Deluxe Kitty Sill with Bolster, K&H Pet Products EZ Window Mount Kitty Sill, Mau, Cat Tree King,  etc.
Window Safety Guard
Pet Safe Disinfectant: Rescue disinfectant, Top Performance 256 etc.