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I too think you'll be fine Thursday night.
The purpose of blowing air through the lines is to try to get as much residual water out as possible. So you want to do just one valve at a time, so that the air attains maximum velocity.
The water tank's plug/anode is usually located below the inlet/outlet lines, suggesting that some water would remain in the bottom of the tank if it were not drained through the plug.
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