For me pocket carry is limited to a fixed EDC locking folder, a Mission Wallet (thin SAK, Peak Matterhorn 1xAAA LED light, signal mirror) 2x$20, and my regular wallet with ID and cash. My EDC backpack carries the bulk, with lots of room for more: FAK, quart of water (used and refilled daily), 4xAA LED light (w/ 4 spare batteries), compass, GPS, a second locking folder, Leatherman multi-tool, magnifying glass, more cash and a Doug Ritter Pocket Survival Pack drop in the bottom of the main compartment. Sometimes I carry add'l clothes, sometimes the main compartment is very empty, depends on time of year.
In any case, I agree with ironraven; you should consider a backpack to carry the things you need to provide for those who can't carry their own. For those who can, they should carry their own water and snacks and essentials (not necessarily the 10 Essentials).