3D printing can be a magical thing, and this potion bottle captures that perfectly.
The included Bambu print profile is designed to provide the most satisfactory transparency and strength when printed with transparent PLA.
This can be adapted to work with transparent PETG, though I do not own any and could not make those adjustments.
Any changes made to the print profile are at your own risk - you may lose out on transparency.
Transparent PLA is clearer at higher layer heights and tempuratures. The included profile uses a white color for transparent PLA, and it prints at 240C. The multicolor profiles also add a color selection for the internal, encased potion “liquid”. In my testing, I was unable to make a bottle which successfully holds water, though I have included a print profile which leaves out the solid infil if you'd like to try your hand at it. If you succeed, I encourage you to share your print profiles!
When filing the empty bottles, and only if you have adjusted the profile to properly seal, you can use water with food dye or isopropyl alcohol with food dye if you plan on leaving it for a long period of time.
Hense, the AMS profile exists for those who do not want to tinker.