I used to use a Carbacap(https://www.morebeer.com/products/carbacap.html?gclid=Cj0KCQiA09eQBhCxARIsAAYRiyk1ZTb1K1mcFd2iKIqI6Ttyce_apX7V534EqlFKcfnp94OwCxpw7sQaA

I used to use a Carbacap(https://www.morebeer.com/products/carbacap.html?gclid=Cj0KCQiA09eQBhCxARIsAAYRiyk1ZTb1K1mcFd2iKIqI6Ttyce_apX7V534EqlFKcfnp94OwCxpw7sQaAingEALw_wcB https://www.morebeer.com/products/carbacap.html?gclid=Cj0KCQ...) adapter to hook up my tank to a 2L bottle. Fill the 2L with cold liquid, pressurize, shake, pressurize, shake, etc. It's amazing to fill the bottle until it's hard and then as you shake it the co2 dissolves and the bottle gets soft. You can carbonate beverages more than normal with this approach. On the final carbonation, you'll want to put the bottle in the fridge for a while before you release the pressure so it stabilizes. I made many custom and weird concoctions over the years with this setup.