I racked my Niagara wine on 2-5-21. S.G. 1.02. It's clear, with no visible co2 coming off. I tested S.G. and it's still at 1.02. I like the taste and the aftertaste is great. It's dryer than I would want it so I thought of sweetening it and bottling it. Can I use white grape juice to sweeten it and if so, is there a formula? I have 2 one gallon jugs and a third 3 liter jug. Do I need to add camden tablets before I do?