If you think juice will help you through basic your dead ****ing wrong...... Your setting yourself up for failure. Basic and AIT (all the branches call it different names) is a mental game with raising your physical fitness level from gamer/couch potato to a servicemember. Yes Basic is less abusive than previously but honestly our society produces softer ppl than previously.
All the gear in the world will prepare you for a total change in life as you know it. Your better off learning to meditate.