Try to scrub your skin with mixture of caffe, sugar and oil, while you shower. Brasilian girls do that, and they say it is good.
Try cutting out sodas completely and you will see results. It worked amazingly for me! Still have some but had tons it was gross
You really can't... you can use creams/oils, etc that might plump up the skin, but there's really no good way to get rid of cellulite.