The cost of each bottle of glass water is as follows:
1. Antifreeze: glycerin 2.7 yuan
2. Colorant: Mountain Dew pigment less than 0.1 yuan
3. Detergent: anionic surfactant 0.2 yuan or less
4. Container: PET bottle 2.0 yuan
5. Trademark: square meter packaging less than 0.8 yuan
Total cost: 5.8 yuan