I know you may not want to hear this but ts for 3 days is only gonna lose water weight no fat loss and you'll regain it your first day eating. If I was you I'd aim to eat low cal for 3 days ( by all means use your packs in place of a meal if it's easier ) as you may not lose loads but what you do lose will be pure fat. 3 days TS won't make a difference to how your clothes fit and you'll be more than likely to binge on your first food day which will leave you more likely to feel bloated and uncomfortable. I think you deserve to feel happy and confident on your holidays, not having the carb bloat will help that I think?
I don't mean to upset you, but believe me I know exactly why you wanna do it but it's not going to help unless it's purely for confidence? Xxx