Answer:
A little pool with two layers of wall around it. One white and soft and the other dark and hard, amidst a light brown grassy lawn with an outline of a green grass. What am I?
If I drink, I die. If I eat, I am fine. What am I?
What can you hold in your right hand but not in your left hand?
What is made of water but if you put it in water it will die?
Six letters it contains. Take away the last and only twelve remains. What is the word?
No matter how little or how much you use me, you change me every month.