1) who makes quality products that are a good value?
2) is there an online site to purchase from?
3) is there a small book filled with wisdom?
4) i would like a second Betta - half moon possibly - which I think means having two (2) tanks.
5) i want all of the salts and treatments and such to have on hand, as well as a variety of foods. the several pets store in my vicinity do not carry such things.
Welcome to Betta Fish, there are plenty and I mean PLENTY of opinions on this forum. Please take from everyone what you think is best that to use their knowledge to expand yours. With that said I'll answer some of your questions on what I
think is best.
1) Brands for food are not as important as their content. For bettas you should look for higher protein foods usually in the 50%-60% range. Always check the ingredients for key words like 'Whole' and actual names of ingredients not chemicals. You will find chemicals to keep the food preserved but they should be listed last.
All water conditioners work but one of the best is Seachem's Prime; it detoxifies heavy metals and ammonia as well as getting rid of chlorine and chloramine like a regular conditioner.
2) Several chain stores have a website where you can purchase their wares such as: Petco, PetSmart, and Walmart. These are usually your more expensive options but they have decent quality. Places like amazon (distribution website) will provide you will great deals that change almost every day so keep a look out and you can find good stuff for cheap.
3) There are several books that can give more specific information on every type of fish but if you're looking just for betta information you can find everything you need to know here.
4) You can have multiple bettas in a tank but requires a divider, you can either purchase one or create your own like: this one.
Of course you will be increasing the bioload of your tank by double so it is recommended that you have at least a 5 gallon tank if you're going to be dividing it.
5) For salts I keep epsom salt and aquarium salt, epsom salt helps with bloat and aquarium salt is used for eternal injuries such as fin rot and ripped fins. You should only have to use 1tsp per gallon. DO NOT get marine salt because this is the salt used for salt water tanks.