Wooden goblets are always popular but if they are to be used it can make life a bit awkward for the turner to finish them. There are a number of finishes such as Rustins plastic coating and various varnishes from the states as well as oils etc that can be used. The problems with a lot of these is that they can make the wood look and feel a bit plastic and if they get chipped the liquid will get through the chip and soak into the wood.
One answer to this is to use a wine glass to hold the drink and make a wooden stem for it, so you have the best of both worlds. You can buy the wine glasses ready cut from suppliers like Turners Retreat or you can cut them yourself this will probably be cheaper and you have a wider choice of glasses to use.
It is not that difficult or dangerous to cut them yourself but it is wise to take precautions. You will be in the workshop so I assume you will be wearing your smock or similar other items you will need are a full face visor and thick gloves for protection and a piece of wood that the stem of the glass will fit over and preferably a small 3 corner file. If you don’t have one of these the corner of a fine ordinary file will work as well but I find the 3 corner version better and easier.