Do NOT shake hot liquids in the shaker! It will pop open and you'll be covered with hot chocolate!
I put the powder into the mug and add about 1/3 of the 8 ounces of cold water. Then I use a fork and/or a spoon to stir slowly, making sure the powder gets wet thoroughly and that I've mashed up any lumps. Then I add the rest of the 8 ounces of water and stir it again. Don't be in a hurry is the main thing. Then I put the mug in the microwave and heat it.
That's about the best you can do. Works well with the cappuccino or any of the hot drinks.
As for the pancakes, my friends on Medifast have found that using plain seltzer water or club soda instead of water make them come out more fluffy. They also don't try to cook three little pancakes--just one big one.
Jay