Sounds like a fun project. Maybe start with a small wooden cup, maybe a bit thicker on the sides so it doesn’t feel flimsy, but not too heavy. A wooden handle could be a nice touch—carve a smooth, shallow groove, so it’s comfortable to hold. For the straw, a bamboo stick is lightweight and natural; you could cut a small notch at the top to keep it from slipping out. Add a simple etched pattern on the rim—something like a tiny leaf or wave design, just enough to give it a cozy look without overdoing it. Keep the surface sanded smooth so the bubble tea stays cool. Finish with a light coat of food‑safe oil to protect the wood but let the natural grain show. How does that feel?