Wow... A full thread on you asking for advise, people giving you advise, and you ignoring the advise?
Basic rule of anything in a tank with water in it. 1-1.5gallon of water per INCH of fish. Bett's categorize as 2-3" fish, so thats 2-5 gallons for a betta. I suggest a 5 gallon.
Fish, along with invertebrates need a cycled tank. Whatever you put in to your betta's 1.5 or 2gal tank, will not strive do to the lack of size and the fact that its un-cycle-able. They need a filter of some sort, and something not overly powerful. Once you get into talking about filters, you need to worry about your betta's tail.
Shrimp are tasty... My Betta has proved that to me along with my Gourami's. This is the reason I stay away from the Cherry shrimp, they are pricy. Petsmart sells Ghost shrimps for about $.10 a piece.
My strongest suggestions to you is this:
If you are going to ask for advise, take it instead of throwing it back at the people who offer it. Next time you'll get less advise.
Listen to people. Some know more about Betta's than you could imagine.
Dont be rude.
Please see the attached link for some help with your question.