Slushies contain a high amount of sugar and/or syrup which lowers the freezing point of water. This means that they will not freeze as solidly as plain water, resulting in a slushy texture instead of a solid ice block. Here are three tips to help your slushies freeze: Use plenty of sugar: Sugar lowers the freezing point of water. So, using a lot of sugar or syrup in your slushie mixture can help it freeze better and create a smoother texture. Stir frequently: Stirring the mixture frequently during the freezing process will prevent large ice crystals from forming and give you a smoother consistency. Freeze it for longer: Slushies need more time to freeze than regular ice cubes or other fruit juice popsicles due to their sugary content. Leave them in the freezer for at least 2-3 hours or even overnight for best results.