Quote - I can get the flask to render with a color, but I really wanted a texture on the glass.  Do I need to make some sort of map for it, or can I use a flat texture? Also, does the texture go in the transmission channel?  I think so but thought I'd double check.

Textures on glass are tricky at the best of times. If it has a texture made for an object but never intended to be rendered as glass, these are easier to work with.

If you're adding a texture to what is being rendered as glass but there is no UV map for said object, you'll probably end up with stretching and distortion of the texture, but nonetheless, it can be done. 

Make sure your image is a jpg and place in the transmission channel within Reality (after changing your matieral to glass, of course). Why this works with a jpg and not a png baffles me, but isn't terribly important for your needs.

Andway, set transmission and reflection colors as close to white (like 250 250 250 is good) and Architectural for the mode (helps to get the glass as clear as possible without resorting to Hyper). 

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