Currently, most of Los Angeles is fine, so there's lots of food, water, clothing, housing, etc. locally available.
Rebuilding efforts are still way in the future and a different story.
But talking of people
giving help now,
World Central Kitchen is working with lots of LA restauranteurs to help feed the firefighters and displaced people. Among them are Roy Choi, the ladies behind the Border Grill and, as I noticed yesterday as they were loading up their food truck in my neighborhood, Dulan's Soul Food.
But getting closer to the motif of the OP...
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ETA:
Oh, and of course Steve Guttenberg was helping to move abandoned cars off the road to let fire vehicles pass on Day One.
A source also told the outlet that Guttenberg, whose house narrowly survived the initial blazes that have destroyed thousands of other structures, has 'banded together with several neighbors whose homes also made it' to do good.
'They are having meals together, working on getting brush out of the way, trying to put out smoldering fires, and fighting embers in the air,' the insider revealed. 'They have been getting food and necessities, portable heaters, water, through rapid relief groups and sharing everything, and basically are taking care of each other.'