Could low potassium levels (3.1), be caused by consuming lemon juice every day? (i'm thinking alkalosis) how else is this diagnosed ? thanks

Not lemon juice: Reference ranges are set so that several percent of healthy folks fall outside on either end. This value is not dangerous and may even be a lab error or momentary glitch in your physiology. Licorice? Have it rechecked sometime. Ignore everything you read about "alkalosis" in folks who feel well -- it's internet bunk. You may have a mild renal tubular wasting, an aldosteronoma, others.