How to not blackout during the BBC challenge?

Doing the buzzball, beatbox, and cutwater challenge and need to not blackout. I am a light weight (23F 5’2) and I would say my perfect level of drunk is about five seltzers and maybe a shot throughout a night out (4 hours). Best tips? Carb load? Water? Help me. I will only drink these three drinks (hopefully) but by my math it’s about 8 standard drinks. Which I’ve done before but not pretty.