I want to paint and stick glitter to glass. I know I can use mod podge for this but it is not food safe. Is there any gloss that is food safe that will allow me to glue embellishments to glass and ceramics? I would really like a smooth finish on the glitter if possible too? Thanks in advance.

You can use clear water decal paper to "seal" the glitter in

Just don't dishwasher the glasses after though.

Your options are limited as glass sealants require heat to cure and those will burn the glitter.