Suggestions on improving F/R balance??

[sy308]

Planning first track and autocross event!! My thought is to improve the F/R weight balance with additional weight in front of car. Ideally, something portable and usefull would be best. Any experience using a couple of cases of beer? My question is would regular be too much or should I use "light beer"? Also, any suggestions on fine tuning by drinking some and jetison of the cans. I don't want to be "Black-Flagged" during my first outing.