i made my first beer last night and didnt add sugar. can i add sugar after fermentation starts? i used 3lb amber dme,1.5 lb bavarian dme, 1ozwillamet hops@30min. 1/2oz saaz hop@5 min.& 1oz amarillo hops as it cooled. this was a 2 gallon boil in 4.5gal jug with airlock. oh and safale s04 yeast@...