Coconut oil melts at 76 degrees, so you don't have to heat it a whole lot to get it to melt. I tried to heat it very gently, in case the heat would damage the oil.
The candy molds I got were cheap plastic, but they worked out great.
Something like this...
I was also thinking - if I have any other supplements to give, I could mix them right into the bar and just dose everything at once. I'd just have to figure out the dosage/proportions.