Some interesting ideas here, a couple that occurred to me were:
Some sort of Alchemy talent that allows you to forage/scrounge/prepare ingredients
Something like the Path of Gold or Path of Many Things that allows you to rummage in your pack / pockets and find an ingredient if you don't have it on your character sheet.
Some sort of talent that allows you to create a staff/amulet or other focus to either store WP or replace the need for ingredients.
Haven't really got through the Magic chapter yet, so that's all a bit off the cuff. Still trying to get my head around combat.