Combine. Add lemon juice, sweetened condensed milk, and water to a blender.
Blend. Puree until smooth. Scrape down the sides of the blender as needed to incorporate all of the sweetened condensed milk into the lemon mixture!
Freeze. Pour the creamy lemonade mixture into your popsicle mold. Cover with a lid and insert popsicle sticks. Place on a level surface in your freezer and freeze for at least 5-6 hours, or until completely solid.
Serve & Store. To release from popsicle mold, run the wells of the popsicle mold under cool water (not warm water or they’ll melt!) for a few seconds and use a side-to-side motion to release popsicle from the mold. Store leftover popsicles in a single layer in an airtight freezer bag or freezer-safe container in the freezer up to 2 weeks.