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There are reports all over the news about the unbelievable amounts of money being raised to help in the rebuilding after Harvey, but if you're not J. J. Watt or Michael Dell, there are still things you can do.
I drove past this truck in my hometown of Huffman yesterday -

 I didn't stop, but according to Facebook posts this morning, it was a couple from San Antonio who loaded their pickup with things like fresh bread and eggs and drove 200 miles to give them away.  Those who stopped said they would not take no for an answer and would not take any payment.