>>13707577Here is a recent study from NASA on consumables requirements for extended missions.
Considering packaging/tank mass and without basic water recycling or laundry capabilities, they came up with 2546kg of consumables for a 60-day mission with a crew of four on Orion. That's 10.6kg of consumables per person per day.
If 75 tons of Starship's payload is allocated to crew consumables, it can carry 7075 person-days of consumables or enough for ~75 crewmembers on a three-month journey.
Of course, if Starship is just a ferry for passengers and consumables to a hotel-style cycler, it is reasonable to expect station-tier recycling capabilities which reduces the water mass by an order of magnitude and would also help with oxygen requirements. The study included retarded tiny COPVs for gas transfer as well which contributed heavily to the total mass requirement. Storing the consumables in a single large tank and transferring to the cycler would make a huge dent in the tank mass which is 30% of the calculated 2500kg.
Scaling down water by 90%, tank mass by 80%, and oxygen by 40%, the calculation comes out to ~1200kg of consumables for 240 person-days or 5kg/person/day. With that number 75 tons fits 15000 person-days of consumables, or enough for 163 passengers for a 3-month cycler trip to Mars.
