Looking over my ammunition expenditures, a dozen Flatbed Trucks should be enough. Six of them support the three Longbows, each truck hauling half a combat load of ammunition for the Arrow IV launcher and a Tech Team to reload them; the other six trucks bringing two combat loads of Thumper ammunition each and a Tech Team for the six Thumper carriers.
With just four 'Mech bays, one Light Vehicle bay, and six platoon bays, I come up with a total of 181 bay personnel and 14 quartered crew. I've got a total cargo bay of 1494.5 tons, so let's budget that. I'm storing the three Longbows and the Marauder II in the transport bays, since they're the heaviest 'Mechs. That leaves six Archers, three Riflemans, and a Warhammer in cargo.
30 days bay personnel life support: 242
30 days quartered crew life support: 2.1
BattleMechs in cargo: 670
Ferrets in cargo: 15
Flatbed Trucks in cargo: 120
30 days spare parts in cargo: 11.65
6 combat loads Arrow IV ammunition: 180
6 combat loads Thumper ammunition: 72
4 combat loads RAC/2 ammunition: 12
4 combat loads MML SRM ammunition: 12
4 combat loads MML LRM ammunition: 12
4 combat loads SSRM2 ammunition: 4
MG ammunition: 1.75
That brings me to 1354.5 tons of cargo for the DropShip, leaving me 140 tons left over, but doesn't count my minimal usage in infantry weapons and ammunition - I've only got one platoon and I might as well give them laser sniper rifles since they can recharge direct from the Ferrets. It's a pretty negligible amount of weight, in all honesty; I can hide it in a rounding error.
I suppose that 140 tons will go to spare armor plate, allowing at least basic repairs. Let's see...the Archers, Warhammer, Marauder II, Flatbed Trucks, and Ferrets use 1,747 points of standard armor, while the Longbows use 684 points of LFF. So I'll stock up on 599 points of LFF armor and 1,680 points of standard armor to keep my units protected.
Component replacement from more serious damage will have to wait until I can get access to the supplies the 1st Tamar Jaegers, but I figure the Dare Eternity will be colocating with their landing forces so I'd have access to their repair facilities. That pretty much covers the supply issue, and spells out nicely what I've got onboard.
Now to get some juicy Clan salvage and upgrade 'Mechs; I want them Clan ERPPCs on my Marauder II already.