i have a 2000 civic and it came with no a/c and i want to make it have it. what do i need and is this possible?

 

It's very possible. The A/C system was a kit that would be bolted on at a dealer. See if you can find the "A/C kit" at a dealer or elsewhere. Or strip all the parts off of a parts car and bolt them onto your car. Replace the o-rings and always use a new receiver-drier though.