South Champ Jnr

Ok, not the most exciting of questions, but ive got a show coming up and so will be removing my whey shakes from my diet to be replaced with egg whites. i read this is effective as even the most clean of protein shakes contains sugars etc that can cause water retention etc. i remember reading an interview with Gustavo Badell were he said he removed all shakes 4 weeks out from a show. my question is will the flavouring systems you get on websites like myprotein and bulkpowders have a negative impact on my contest prep? the nutrition doesnt go into much detail but just says artificial flavourings and sweetners. i hate the taste of egg whites by themselves but was hoping to add the chocolate flavour. If not ill just have to man up and go with the egg flavour!