I think its been proven that we could all live without the mod cons that have become part of today's life, especially over just the past few decades, but I would like to not be without:

electricity (light, cooking, entertainment, communication, warmth)
my glasses or contact lenses
a bed (comfort)
clean tap water (and running hot water!)
camera/photos
shoes (I'm hopeless in bare feet)


I have become reliant on:

car/transport
electricity
wallet/money machine card
a wage/salary
shops for food instead of growing food myself