How do you sharpen your knife and axe?

And do you carry it on you when on the trail?

Cause I am looking for something small to use both in the field and during the upkeep back at home. I don't want any complex systems or sets. One universal stone for wet sharpening of both, my knife and axe would be the dream.

But due to lack of experience I am not sure which to pick. So if you have a moment I would be super grateful for any tips!