Okay, you have a hypothesis now, but it is still just a bit vague - "will produce the most alcohol" by what process? This is what Billnotgatez is trying to get you to make explicit.
Second, your aim and title could use a little refining - "strength" is too ambiguous a word for the point you are trying to get across. Your hypothesis describes your point better.
Now to start your experimental design, look carefully at your hypothesis. You are implying two measurements. How will you measure those two values? Are there any other variables that would need to be controlled? What are they and how would you control them?