Hi Susie, check your local home depot or lowes and you'll find that Rustoelum makes tub and tile painting kits. I hear they work really well!
Rustoleum sells a paint kit.
Yes, the epoxy paint kits made for that sold at home depot is your best bet, step by step instructions are in the kit. All other paint techniques won't last as long. The epoxy kits last several years, enough To save up for a remodel.