Yes! I bought one of these and run it right to the tank without a regulator. I close the tank after every use. Currently I swap the tank at a local liquor shop, but there's a welding supply place I will likely switch to in the future to get a better price.
Supposedly you can refill the smaller cylinder tanks but I think this is easier
I bought the adapter to fill the bottles but i believe they have a valve protector of some type. I have to fill really slowly and if i open the valve to much they stop. Even if i freeze them i can only get them about half full. I got my tank from a keg shop. I think it was about $80 and $20 to refill. I'll check for the hose adapter to the machine.
I've tried different things - freezing, upside down, etc. It's hard to hold everything without a helper. I just bought the adapter to contact straight to the machine. Will see how that goes tomorrow.