It's Great To Gain

After Swizzle explains the options of muscle growth and body switching you say," I've always wanted to get bigger, why don't I try the muscle growth thing. Are there any bad effects?"
"If you take too much your muscles will grow too quickly and ache for hours," Swizzle explains," it's not recommended to take too much powder at one time."
"I understand," you answer with a nod.
Swizzle reaches under the counter and brings up a super sized powder container, like the ones Mike has for his protein and vitamin shakes.
"This is more then enough for a week usage," Swizzle explains and hops off his stool and comes around with a scale in his hands. Swizzle places the scale down on the ground and kindly asks," Could you please step on to it?"
You agree and the scale goes to your normal weight. Swizzle thanks you and you step off the scale and Swizzle says a few magic words and you feel like someone is tightening strings around your arms, legs, chest, and waist. Then the feeling fades.
"What was that?" you ask a little stunned.
"Just a magic spell for measurements," answers Swizzle holding up a piece of paper and writing begins to appear on it.
"Cool," you say and it prints out your sizes.
"You may go now," Swizzle says," take the powder as directed. A little extra, maybe, but too much could be hurtful. Phone me if you need help. I'm in the yellow pages."
"Thanks Swizzle," you smile and take the powder bottle and put it on your CD bag and wave goodbye to Swizzle.

You walk the 5 minute walk home and see that Mike's truck is no longer in the drive way. He must have woken up while you were at the mall. You walk inside and decide to read the directions for the muscle powder. You set the powder down on the kitchen table and take a seat and read the instructions:

Muscle Powder

To grow your muscles at a rapid speed take spoonful of powder twice a day in liquid. Take with food. Careful not to take too much.
Regular exercise with powder is recommended.

Sounds easy enough, you think to yourself. You stand up and get a spoon and open the fridge and take out some Orange Juice and pour yourself a glass and take a few cookies and open up the powder bottle to see a little scoop inside. You take a scoop full and dump it into your glass and mix it with a spoon and drink your juice and eat your cookies.
With that done, where should you store your Muscle Powder?