I am thinking of trying regular table sugar to see how that works as it is cheaper and always in the house, but who knows. I like the convenience of just dropping in the single drop, filling and capping. So, to answer your post, I use store bought beer bottles all the time.
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I use a combination of table sugar and Coopers drops. I found the drops overcarbed my NEIPAs, but worked well with my dark beers. I weighed a sample of drops and came up with an average of 3.4g. A rounded 1/2 teaspoon of sugar averages 3.2g. while a level 1/2 teaspoon averages 2.0g. So, I use a level tsp. in my NEIPAs and when I run out of drops will use a rounded in my darks. YMMV.