Brew decaf coffee in the refrigerator overnight. I use 1 cup ground coffee to 4 cups filtered water in a tall jar with a tight-fitting lid. Shake well before placing in the fridge so all the coffee gets wet (it tends to clump up).
Strain coffee using a coffee filter into a clean jar. This usually takes at least 30 minutes. Replace the filter midway through if it seems very slow. You can put a filter inside a strainer or a funnel, or both. Make sure it's all balanced so you don't end up with coffee and grounds all over the counter.
Blend 2-1/2 cups coffee with the coconut milk, vanilla, and stevia extracts.
Fill molds to the top with coffee mixture. Freeze 60 minutes. BE SURE TO SET A TIMER!
Insert the sticks by pushing into the partially frozen top layer about halfway down as evenly as possible (check that they are vertical).
Return to freezer and freeze several more hours, preferably overnight.
To unmold: Fill a tall glass 3/4 full with warm water. Hold each mold in the water, taking care to keep the edge of the mold above the water line. After approximately 45-60 seconds you will be able to pull the pop out. Have a ziptop freezer bag ready, and freeze pops as you unmold them.