Decision to make regarding rifle / EDITED

I find myself running low on air when I go out to shoot varmint birds and squirrels. I want to just put the rifle in truck and go and not load up a tank and bla bla bla. 

I'm currently using a FX Dreamite .22. Absolutely love the rifle. I shoot most time seated from truck seat and rest on side on mirror with hand. I wanted to add a bottle but was advised of the add on weight and bulk..( A PM was sent to me somtime back when inquiring about adding a bottle) 

So, what are my options?

Buy a bottle and adapter for the Dreamlite? Order the new Wildcat MK III "BT" ? Ideas or suggestions? 
 
ideas .. the bottle doesnt have to be hanging off the gun, its the same air if that small bottle is in a backpack ...

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If you're killing multiple dozens of pests on your outings and don't want to bother with a bottle to refill from? Then maybe you do need a bottle gun.... This way you can go on multiple outings on one fill...

+1 went to a bottle gun 25 cal 580 impact and 500 cc on my raw hm1000x get 60 plus on both guns shooting 34 gr at 905 fps also carry a 90 cu in carbon fiber tank for one top off but never really needed to top of either gun on a hunt