The humble potato may not be all that nutritious without its skin, but consuming the well-scrubbed skin in addition to the potato is a fine idea because it contains lots of Vitamin C, fiber, and B vitamins, in addition to plenty of minerals. While the skin may not be palatable in a mash, it's fine in baked potatoes or home fries.
Organic milk will actually keep longer than regular milk. You can store and use milk for five to seven days past its "expiration date," which is actually a pull date for the stores. Organic milk will last for even longer in your fridge than regular milk and it tastes better, too.