1. Adding thickener: Use some food-grade thickeners, such as gelatin, pectin and agar. , dissolve it in proper warm water, then add it into water and stir it evenly.

2. Stirring or stirring heating: By stirring or stirring heating, the interaction between water molecules can be increased, thus increasing the viscosity of water. You can use a stirrer or an electric stirrer to stir, or you can heat the water to a certain temperature before stirring.

3. Cooling: Cooling water can increase the interaction between water molecules, thus increasing the viscosity. You can cool the water in the refrigerator for a while, or add ice cubes to cool it down.