Learn English – What do you call a person who always has what you need

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For example I seem to always have what everybody needs/wants, from Advil to bobby pins to a deck of cards. What would you call me?

I would just say somebody is ready for any occasion or well-stocked.

I think the simplest term is prepared.

to make yourself or someone else ready and able to deal with a future even

Boy scouts are always prepared and if this person just had 100s of items and was a woman you could go with Mary Poppins.