If u know how to play the GUITAR

Hey i need a little help, i ve been lazy over a couple of years and want to get back to my guitar playing. Sadly, heres the thing, we got rid of the keyboard long time ago. And i dont have much money to spend. So, my guitar is out of tune.

What should i do? And what i mean by that is what CAN i do to tune it right without spending any money?

Hope for suggestions, thanx!

~Amor Aisu Anime
(triple A) XD X) XP