Answer:
No matter how little or how much you use me, you change me every month.
A beacon from home to guide your way. It can be a lifesaver on a stormy day. What is it?
What has a spot and is very bright, is sometimes, red, white, blue, yellow or green and is often blinding.
I'm light as a feather, yet the strongest man can't hold me for more than 5 minutes.
It's like food but water kills it. What is it?
What never gets any wetter no matter how hard it rains?