Dont worry, I read that it can take some people 2 weeks to get fully into ketosis, it just depends on the individual. If you are doing everything properly you will be burning fat already, so dont be disheartened. Thats why they advise not to have the bars for the first 2 weeks-cos the extra carbs could poss stop you getting into ketosis.
Like Jenna said, keep drinking, stick to SS 100% and you'll soon be in ketosis.
Good luck! xx