Don't drink coffee the day of the judging. According to Carr's Sensory Evaluation Techniques, it can impact your palate for up to an hour. Smoking is bad, too, but according to the book, its effects don't last quite as long.
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Any brewer worth their salt knows that a recipe is only a start. Good beer is a combination of skills that extend far beyond the recipe.
I forgot to ask at the store, is that a 5lb CO2 bottle?
Why not just freeze it instead of canning it? If you can it you don't need to put it in the fridge.
How much extract would you guys recommend for a 5 gal batch?