Here's what I do. I pop out one of the bloodworm icecicles and put it into a paper cup. I use another cup to take out about an inch of tank water, and pour it over the cube. then I pop the paper cup into the microwave for about 20 seconds, swish it around, make sure it is lukewarm, then use a spoon to scoop up a small ammount of water and worms, make sure you have your betta's attention, and pour 'em in.
when I am done, I usually have leftovers. I leave the leftovers in the water and pop the paper cup i the freezer to use again. Works great!