for the first couple of years that I was dosing I just baked baking soda in the oven. Cheap and easy. I baked like 3 large boxes worth and stored the result in zip loc bags. I tried soda ash recently and it was nice because it mixed a lot easier than baking soda. However, I ran out of it and kinda find it a pain to have to order more form BRS. Instead I just went to Superstore and bought more baking soda and baked it again. Anyway, I am using recipe #1 because my pH tends to be lower (7.9-8). If your pH tends to be higher you can use recipe #2 which doesn't involve baking.
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