64 oz is such a small amount of beer, I’d be inclined to save some 2 liter soda bottles. You can fill them with beer and a sugar priming charge and they will carbonate and hold the charge nicely. You can also purge the bottle air by squeezing slightly and tightening the cap. The bottle will feel firm as it carbonates.
Only issue would be transport or storage, you would want to shield them from the light to avoid skunking. I’ve even seen brown plastic MUG root beer bottles you could use which would be best.
