Carbing old drinks?

I have a half galon of some home brew hard apple cider in my fridge , it tasts ok but i want to spark it up , i was thinking of adding some consentrated apple juice to sweeten it and then a small amount of yeast to carbonate it... how much yeast will i need to carbonate this ... i wanted to bottle it in beer bottles.

any ideas ...

I'd think you'd need to let it ferment then add priming sugar. I'd stay away from allowing the primary fermentation in a sealed container ... I think you are looking for trouble. BIG trouble.

let it ferment agean? ... i can do that... thats not a problem .. i dont want the flaver to change much just a little sweeter and bubbly. can i use the consentrated apple juice as my primer then bottle?...

i was thinking like 1/4 tsp yeast , 1/4 cup apple juice consentrate

let it sit for an hour or so at 68f then bottle and age for 1-2 days.

then cold rack to the fridge. and drink verry quickly before they blow.

im just bored ... didnt make it to the LHBS this weekend as planed.

the apple wine was 3 months old sealed and cold when i got bored

added - 1/2 cup applejuice con.
1/2 tsp ale yeast
fermed for 2 days
bottled without sugar

tasts sweeter and now has carbanation. - drink asap
worked ... however i think im going to store them in a 50cal ammo tin just to be safe
Drink up!