That’s not actually a solution when talking single-use either. Remaking the bottles from recycled glass is incredibly energy intensive and not an environmentally friendly process either. Multi-use bottles are much better, but the cleaning required also isn’t that simple and also relatively energy intensive (far from remaking the bottles of course).
There’s also practical downsides to glass (heavy, breakable), but those are subjective and their relevance highly depends on the use case.
Ideally, we wouldn’t buy stuff to drink in any kind of bottle, but just use tap water. possibly just buy some concentrated stuff to then make your actual drink at home. Nothing beats the effectiveness of transporting water through a simple pipe, but that isn’t even possible everywhere in the world due to drinking water quality issues…
If micro plastics in the water supply is an actual issue long term the tap water will be shot for the whole of most places. Reverse osmosis systems are the only ones I had heard could reliably help, but I haven’t gone to extensive on looking into that. Each household may someday need under the sink or such systems if so : /. Unless we can reliably do so at treatment plants and then transport it through the lines without the water getting any back in. With many American cities having water at its current state, I don’t see that happening.
A surprising number of companies actually do sell powder versions of their drinks on the web. I buy both Arizona tea and A&W root beer packets online.