WHAT YOU NEED:
Bottle of fizzy drink
Any left over fizzy drink can be flushed down the toilet to clean the bowl and pipes.
Drop two mentos in a bottle of fizzy drink, like diet cola
Tip: Diet cola can stain clothes (particularly the cheap brands) so try to use diet lemonade instead. Also, the cheaper drinks tend to work better (bigger fountain) than the more expensive brands.
Science at home