From the tutorials I read, it depends on how detailed you want it, as well as if there's any fluid or anything in it. if the bottle is transparent or opaque, and if the bottle is freestanding vs. embedded (because of a light source).
For advanced tabletop, I painted the glass dark brown or dark green, then held it up to a light source. Wherever the light hits it, paint a lighter color. Then paint over it with a Tamiya Clear.
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