7 day fast planned for 16/05-23/05 any help

This will be my 3rd time doing it and wanted some tips and tricks to make it as smooth as possible

SW:124kg

GW:90kg

how much would you think i can lose in this week with some light walking and gym/exercise/exercise bike.

I know about electro lytes, caffeine and salts but anything else to stave hunger?

is a dirty fast ok like drinking squash and 0cal soda or will that limit weight loss.. any help is appreicated