Hi, my two cat's are 1yr now we got them when they were 8 weeks.
I only bought a little scratching post with a platform on top, but I wish I got a bigger one! I have now made my own out of a birch tree- about 4ft high with some toys on and put the old platform at the top.
I would defo advise to get more than one food bowl- and not the double one- as if one kitten is more dominant than the other s/he might growl and stop the other feeding (mine did!)
I didn't bother with a fountain- and also found my two would rather drink out the dogs dish or the toilet!! than their own water. Lol!
They will probably like to sleep together so a nice comfy bed will do

Ours slept curled up together on the couch. Even though I had bought 2 beds!
I wasted money on toys for my cats, they wouldn't even look at them! My female loves string! And my male loves shiny scrunched up wrappers!
Oohh- get a laser pen! they keep cats amused for HOURS and you can get them racing across the room and jumping over the dog
xx