So, I put my beer all into growlers last night for the last part of the process. Now, I am worried I didnt put enough sugar and I dont want flat beer. Is it possible, since it has only been in the growlers for a day to reopen them, boil some sugar, and put a little more in? I know you dont want too much carbonation in order to avoid a beer bomb but I dont want my whole batch ending up flat. Thanks!