The other dragon that’s already there is used and the extra people are strapped to the floor. They don’t even need suits (while yes, it would be needed in a decompression event, they’re mostly there for cooling and communications).
Dragon can bring six back in one craft, it just won’t be very comfortable for two of them. But they’ll be alive.
If you have the ability, a tool like YNAB (You Need A Budget) might help.
Here’s a link to the setup video showing the app and its contents. It’s an hour long, but I think it does a really great job of covering the concepts and hitting on what you’re talking about here.
https://youtu.be/wdGhrEKkxsM
I have no affiliation with them except having been a customer for ~10 years now, but it’s done wonders for us. Check it out!