TKD questions..

[iced earth]

Hi everyone, I have a few questions, I was wondering if I drink 1 cup of Starbucks coffee w/ 1 Sweet & Low (sweatener) in the morning will it prevent me from getting into ketosis? I've read on different diet forums that smarties or sweet tarts are good pre-workout carbs (TKD), is this good or is there something else I could eat? Thanks