I agree with the spreadsheeting. Use Google Docs and you can share it so everyone can have input. As leader you don't have to know everything, you just have to know who to ask questions of
Personally I break my spreadsheet down in a couple of ways:
Catagory: Cook Kit - Food - Sleeping/Tent - Ditty bag - First Aid - Clothing
These get broken down into two parts - Required & Nice to have
If you get everyone to put together something similar, you will all be able to figure what is needed solo and what can be shared.
Just a suggestion
I know if I see it laid out it makes it easier and I am not so worried about it. Everybody has their own method. No doubt you will find yours.