had to add the battery part since you asked about "equipment" - that was cute!!
If you are going to be bringing home a kitty - the only real essentials are:
kitty litter box (so many different types available, the cat will really not care one way or the other what you get - so the choice is really up to you, deep, shallow, covered, etc.)
Kitty Litter - again - it's a matter of preference - I like the clumping clay litter - you can use a scoop to get out all the "stuff" without having to wash out the box everyday.
Litter training - you'd be surprised how easy it is to train a kitten - oftentimes, when you bring them home, they are already trained - the mother typically trains them as soon as they are able to get moving around - sounds gross, but the mother encourages them to go to the bathroom, by grooming with her tongue - as soon as they are able to go to the bathroom by themselves, the mother immediately brings them with her to the box and makes training unnecessary. I can get you some info should you find that the kitten is not already going in the litter box.
Bowls - I would recommend a separate water and food bowl (not the kind attached together) - just makes it easier for cleaning, etc...
Ceramic or Stainless Steel are the better of the options - as they are non pourous. Plastic food bowls can harbor bacteria because the food/water is absorbed into the plastic - this can cause breakouts around the mouth of cats. I would recommend bottled water if you can (vs tap) - because of chemicals used in the purification of tap water.
Scratching post or the little scratching boxces you can buy at pet stores - it's not necessary that you have one (or more) of these - but if you wish to train your kitten to scratch something (outside of your furniture) you will need this or suffer the consequences....
A digital thermometer (yup for taking the temperature you know where) - should your kitten get sick and you call the vet - one of the first things they may ask you is for the temp - so it's a good idea to have one specifically for kitty on hand.
A nice to have too would be a few toys - don't have to be anything fancy as kittens love to play with just about anything.
You might want to pick up a book or two to have on hand for various questions.
A good one specifically for kittens is called "How to raise the Perfect Kitten" - it talks alot about how they behave and stuff and training them (I gave mine away so I don't know the author). Another is one that I use for alot of questions is "Dr. Pitcairn's Complete Guide to Natural Health for Dogs & Cats".
You will want to have food for your kitten on hand - I'd start out with whatever the owners now are feeding it - and if you decide to change the food - introduce it slowly mixed with whatever it is used to eating. This way, you'll eliminate the possibility of upsetting kitty's tummy with changing the food right away.
Something good to have on hand for diarrhea is pumpkin (from a can - not pumpkin pie mix, but plain pumpkin) - about a teaspoon when they have "D" can help them out.
A book you may want to read too - concerning pet foods - to select one that you think would be good for the cat is a book called "Reigning Cats and Dogs" - it's an eye opener about some commercial foods. A pet store is a better place to select a good grade pet food than the grocery store - if you can.
These were just some initial thoughts - hope some was at least useful.
Good Luck and Enjoy your new little "BABY" What is it's name going to be???
