The answer is: it can be filled with water. The bottle is made of organic silicone. Temperature -40-220 degrees, durable, never deformed. Can fold into the pocket to use!
The silicone water cup is made of food-grade liquid silica gel + plastic PP without BPA (bisphenol A). The product is made of food-grade silica gel.
The reason for the peculiar smell is that during the production process, the silica gel is baked at a high temperature in the oven, and the product is delivered directly from the production line to consumers.
It is recommended to clean them with detergent before use, and then boil them in the pot for 6-7 minutes to disinfect them and remove the peculiar smell.