Pour some of the sports drink you are using into each popsicle mold for the first layer; using a funnel for pouring into the molds works well.
Place in the freezer to allow it to fully freeze (usually around 20 minutes but verify before pouring the next layer).
Continue making layers and freezing the popsicles until the molds are slightly under halfway full.
Tear a piece of foil to fit fully over the top of each mold.
Tightly wrap a piece of foil over the top of that mold and using a paring knife, make a small slit to insert the popsicle stick (don’t make it larger than the stick or it will not hold the stick upright to freeze in the proper position).
Insert the popsicle stick. Do this with all of the remaining molds until they all have sticks inserted. Freeze until fully frozen.
Continue to add layers, freezing in between, until the molds are full and frozen.
To release the popsicles run the outside of the mold briefly under hot water until pulling on the stick releases the popsicle.