I would start it over, because otherwise you wont have an accurate reference point as to what to start with next time. The key is to have a consistent and steady rate from one day to the next.
70 degrees is fine. It'll produce more at higher temps, but will also run out sooner. Other than the initial proofing process, best to just go with whatever the room temp happens to be. You can of course use warmer water to mix the recipe, it'll help the reaction get going faster.
Also you may want to try 1/2 tsp yeast. Not sure if 1/4 is enough for a gallon of water. I used to do 1/2 tsb with 2 liters, which would run pretty steady for about two weeks. You may get a longer duration with one gallon of water, because alcohol levels will take longer to reach toxic levels.
A lot of it is going to be trial and error on your part, to see what works best relative to how much CO2 is produced, and for how long. Just remember the goal is to maintain a steady rate of production from one day to the next. Dont let the bottle wind down for a week or two. As soon as you see it slow down - at all - then it's time to make a new batch.
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Last edited by burr740; 12-08-2015 at 08:43 PM.