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Rodinal powder or liquid?

Right, just mix it 1:25, 50, 100.. whatever and use as a one shot developer. I have been using the same bottle for about 6 months and am about half way through. With the exception of Kodak HC-110, you will not find a cheaper way to develop film. At least with a manufactured product.
 
Indeed 1+25 1+50 or 1+100. You can use tap water. The developer is not very critical on tap water quality. Always use Rodinal as one shot developer.

The liquid concentrate can be kept for a very long time.

Here is a PDF of Rodinal:
Dead Link Removed
 
+1.

It lasts seemingly forever after the bottle is opened...one of its endearing qualities. Even when the developer is rust coloured or darker, it works fine.