What is it?

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Across
  1. 2. Something you write with.
  2. 6. You drink water from it.
  3. 9. It grows on top of your head.
  4. 11. Something you drink.
  5. 14. We live on it.
  6. 15. You put tobacco in it and smoke it.
  7. 17. It is the first number.
  8. 18. Something you write on.
Down
  1. 1. You drink hot tea from it.
  2. 3. It is not the day.
  3. 4. You can go across it in a boat.
  4. 5. It gives us milk.
  5. 7. A place where you buy things.
  6. 8. It is big and grows in the garden.
  7. 10. It lays eggs.
  8. 12. It is between your shoulder and hand.
  9. 13. You wear it on one of your fingers.
  10. 16. Something you draw.