Clean riddles

What is black when you buy it, red when you use it, and gray when you throw it away?

What has a head, a tail, is brown, and has no legs?

The day before two days after the day before tomorrow is Saturday. What day is it today?

Whoever makes it, tells it not. Whoever takes it, knows it not. Whoever knows it, wants it not.

I am always will be coming, but I will never come. What Am I?

What's orange and sounds like 'parrot'?

Alive without breath, As cold as death; Never thirsty, ever drinking, All in mail never clinking.

I weigh almost nothing. I am lighter than air. But even the strongest man in the world cannot lift me. What Am I?

It's 7:00 am. You are asleep and there is a sudden knock on the door. Behind the door are your parents, who came to have breakfast. In your fridge: bread, pasteurised milk, juice, and a jar of jam. What will you open first?

Your friend shows you two jars, one with 100 red marbles in it, the other with 100 blue marbles in it. He proposes a game. He'll put the two jars behind his back and tell you to pick one of them at random. You'll then close your eyes, he'll hand you the jar you picked, and you'll pick a random marble from that jar. You win if the marble you pick is blue, and you lose otherwise. To give you the best shot at winning, your friend gives you the two jars before the game starts and says you can move the marbles around however you'd like, as long as all 200 marbles are in the 2 jars (that is, you can't throw any marbles away). How should you move the marbles around to give yourself the best chance of picking a blue marble?