Freeze dried isn't recommended to feed as a regular meal - the freeze drying process (and some freezing processes) remove a lot of the nutrition from the food. It's high in protein, but is generally recommend to feed only once or twice a week at most.
Ideally, you don't want to pre-soak their foods (with exception of frozen, you will want to defrost it first), as when the food hits the water it starts leaching out all of it's nutrition - so with freeze dried it starts to break down what little nutrition it has. Pre-soaking the food also does not help prevent bloating, as bloating occurs due to over feeding, and feeding low quality food.
If you are looking for nutritious food for the betta, high quality pellet foods (such as New Life Spectrum, Omega One, Atison's) is a better alternative. Frozen can be fed a few times a week as well to give them a boost of protein.. frozen being better than freeze dried.
I applaud you for looking for good nutrition, just keep in mind not to always believe what is on packages.