This is when your improvising skills and hygiene skills are put to the test.

Better be prepared to sacrifice some socks!

Well, cat fur is very soft and absorbent, and it'll teach the little bastard a valuable lesson about destroying your shit tickets. I think it's quite clear what you must do.

I hope you can afford food for your cat!

While it's low quality, dollar stores carry toilet paper. If you don't even have $1 (plus sales tax), you could either ask a friend or, if you're desperate, go somewhere like the public library where you're not expected to pay for anything, and grab a few handfuls to hold you over (since usually full rolls are locked up).

I heard good things about rinsing with water. Just keep a bucket of water and a couple of face cloths near your toilet. As a bonus, you will never ever forget to wash your hands afterwards. Forget it if you don't have enough money to buy laundry soap, though.

Sell the cat

Time to raid the office toilet.

another reason I hate cats

You can buy a 4 pack of toilet paper at the dollar store, start keeping an eye out for change.