Simplefit requires almost no equipment but here are some products you may find useful.

This is a pull-up bar that you can use in any doorway without any type of installation.
Iron Gym Total Upper Body Workout Bar

These fitness rings can be hung from the pull-up bar above for push-ups, pull-ups, and dips making the movements more dynamic and recruiting more peripheral muscles for stabilization. Rings also also allow arms and wrists to rotate more freely reduce the risk of repetitive strain.
ProSource Exercise Fitness Gymnastic Rings

This is a good watch for keeping workout time.
Timex Men's T53151 "Ironman" Traditional 30-Lap Memory Recall Black and Gray Resin Watch

This is a good high bioavailability whey protein. Jarrow is a very good company you can trust to never put any weird shit in their products like many of the other protein makers have been caught doing. Always best to put real meat in your body as a protein source, but that said this is a great ultra high quality product.
Jarrow Formulas Whey Protein, Natural, 2 Pound