If you mean a cute butterfly charm glass / drinking glass, these are some nice options:

• 🦋 Cute everyday option: butterfly can glass
• 🎀 Aesthetic + straw: 3D butterfly glass cup
• 🌸 Set option: Nestasia butterfly tumblers
• ✨ Elegant: 3D butterfly wine/water glasses

If by “butterfly charm glass” you meant a glass bottle/sipper with a butterfly charm attached, tell me and I’ll find those specifically.