The new vials that were just released recently hold 4 ml, yes. I can definitely see a colony of 200 big ants requiring maybe 3-5 ml weekly.
I do have concerns about the hybrid nest you mentioned. I haven't seen them in person, but I do know the outside dimensions are only slightly larger than a GroTube. I would estimate it to be able to hold a few hundred, so you should be good for a few months at least.
I had concerns also. I originally thought there was about 100 workers. That is until I counted 100 just on one side.
Normally I'd like to make something myself but they really need proper hydration. I was pretty unprepared also 😂.
Since I already ordered it, I was thinking I could get a second for a satellite nest. Would there be any concerns regarding split nests?