We just ran a hose out from our church building, or school - but water isn't the cost issue here that it is in California, so they never told us how much it cost. as for supplies, everyone who had one brought a bucket from home, so just the cost of soap, a bottle of windex or two (we brought from home, but ...) and some sponges and rags. And the sponges and buckets can be used over and over ...
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