from what age can i start giving health drinks to babies??and which ones are good to give?

You can give home-made smoothies to your baby probably after 1 year old, once they have tasted most of the fruits and vegetables, and understand what to avoid in case baby is allergic to it. It is very nutritious as no preservative or addictive in home-made smoothies. You can get some ideas from here: http://wholesomebabyfood.momtastic.com/babysmoothiesrecipes.htm

Not too sure what you mean by health drinks but I reckon that breast milk or infant formula should be the main drinks for babies throughout the first year of life. Things like juices, sports drinks etc contain sugar that can decay teeth and pile on the weight should be avoided till baby is very much older.

What kind of heath drinks? Nothing is better then water. My two cents

thanks