I'm with Phoenix-cry. You picked a good selection of low light plants, with the exception of the hairgrass, which prefers higher light. I have a 2.5 gallon tank myself (shrimp tank, not betta tank, but close enough), and I just use a desklamp over it. Easy, efficient, and cheap.
I'd go with the java fern, moss, and marsilea and maybe throw some floating plants on top to make the beta a little happier. For tall growing plants, you can go with some needle-leaf or narrow-leaf java fern, or just use some driftwood and tie moss to it for height. That will keep your 3 gallon very low maintenance. I wouldnt even dose the tank with any ferts as long as your lighting is reasonably low.
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