Answer:
Don't do this in the shallow end.
A beacon from home to guide your way. It can be a lifesaver on a stormy day. What is it?
I'm tall in the morning and short in the noon. I disappear at night but I will be back soon.
What stays on the ground but never gets dirty?
It's been around for millions of years, but is never more than a month old. What is it?
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?