Clear Correct lisp - tips to fix?

I have just started my clear correct. I am on first tray day 4. Today is my first day back in the office and I need to talk quite a bit and the lisp is very annoying! It feels like its due to a combination of air and saliva getting into the tray and making the lisp sound. Are they any tips or suggestions on how to get rid of this? If I can't stop it I will probably look at cancelling the Clear Correct and doing normal braces or not bothering at all.