Hi R.. I grew up on a farm and like my compatriot, we wormed all of our animals ourselves with wormer from the feed store. (My mom used to joke that she wormed puppies, kittens, horses and kids all once a year, every year. She used people wormer on us, just in case you were wondering.:-) I'm sure you can buy wormer online. Usually it is in little coated liquid caplets and you just give it like you give any other medication to your cat, i.e. down the throat.
I noticed no one has said anything about the fleas yet. Maybe none of us want to admit to fleas. I had them in my house. We adopted a dog from a shelter and soon we had them everywhere. We tried everything we could to get rid of them without chemicals, then with chemicals. After a month of a steadily worsening infestation, we finally called a pest control service. I think it was called A-1 Pest Control. It was a pretty serious fumigation, but it worked right away. When you are a self confessed neat freak and greenie like me, waking up to discover a flea in your bed makes you abandon your anti-pesticide stance pretty quickly. Embarrassing, but true. ;)
Good luck.