You will need to boil the DME with some water to make more wort, then add it into the fermentor. The volume will increase and the FG will decrease. I would suggest just doing it all at once. Its only a 1 gallon batch, and I dont typically leave my beer in the primary for more than 2 weeks. Especially if there are hulls or other things in the trub it can give it an off flavor.
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