What are the side effects of drinking red bull AND bioplus syrup on a daily basis? Surely this must be harmful to the liver, kidneys and heart...

It depends on the quantity. If you're chugging a gallon of red bull than it will be a problem, but if you have a can it won't be so bad. How much of each are you consuming? Have you tried stopping? I know they'd be addictive so it wouldn't be easy, but it is possible.

Drinking coke every day is a problem, drinking too much water can hurt you.

I agree, one can of red bull is a habit, but not much worst than several cups of coffee.