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NOTE THIS: Even as your valve opening reduces in diameter, it may not necessarily affect your lifestyle until it's dangerously small. You may feel tired or "draggy," or dizzy or short of breath (don't ignore these symptoms!), or you may feel fine. But one can get to the point, still feeling fine, where even a heavy meal or sudden exertion or a few minutes in a hot tub can put too much stress on the valve, causing it to unbalance your heart rhythm and result in sudden death.
So I think the answer is: what you may safely eat, drink, or do may be anywhere from normal amounts to very little, depending on your present condition. A cardiologist can tell you when practicing reasonable moderation in all things is sufficient, and when it isn't. Don't imagine you are well because you aren't on medication--there is no medication for this condition--or because you feel normal--you will feel normal until you are well into the danger zone, and the presence of symptoms may be too late a warning sign.
If your valve opening becomes so small that the risk of surgery is less than the risk of not having surgery, a cardiothoracic surgeon may swap out your aortic valve for one made of metal or a non-metal valve from a pig or cow. If drinking alcohol is important to you, you must make this fact clear to the surgeon in advance, as it will greatly affect the type of valve he will implant and thus your future relationship with alcohol.
Be careful and good luck.