It wont turn out the same, but you can. You just have to stir it, knowing that it will, eventually thicken up like paste. You can also substitute fruit juice, for cold water. I suggest you heat the water in a measuring cup, in the microwave. 2 minutes should be long, enough. Only problem with trying to boil water in a microwave is, you can't see it boil. But the water will be hot enough, after 2 mins in the mirco.