First you need to fill a large jug with ice to the top.
2 ltr Ice
Then fill 1/3 of the jug up with one color fizzy drink.
500 ml Fanta wild berry
Fill the next 1/3 with the next color fizzy drink, limeade is an excellent choice to get that toxic green Halloween color.
500 ml Fanta orange
Then again to top the jug off with the third color.
500 ml Limeade
Thats your Halloween toxic fizz party drink ready to serve.
Notes
I would suggest that you serve as soon as possible after making. As the ice cubes start to melt, the colors will blend into each other and lose their wow factor.I used Zero sugar drinks as they were what was available in my local supermarket, buy whichever drinks you like best.