Check with your doctor or pharmacist before adding potassium if you are taking blood pressure medications or diuretics, but otherwise you can add up to 400 mg per day in the form of tablets or you can also use a salt substitute that contains potassium chloride.
For women especially, it's also a good idea to add a calcium/magnesium supplement. When I check my fitday report on daily nutrition, those are the two that I am consistently not meeting, so I supplement daily. I've also heard that if you take these at bedtime, they help you sleep better.