Replying to Gotta question for ya

I put it in the snowmaking cult but no one ever checks that cult so im puttin it in here incase any one knows.

me and my friend are thinking that we are gonna make an interior mix tee gun for our first run. but what i really need to know is if thats something where i could just go into a hard ware store with like 60 or 70 bucks and just pay for everything and go home and then through it all together?? weve got a hose and a compressor but we need to know if we can just go there and pick up the stuff and make a tee gun.