Hi :)
I've been looking on Google (as you do! lol) and there seems to be conflicting advice so thought would canvas opinion on here! 
My lo is nearly 8 months old, and for a few weeks I've been giving her Robinsons Cordial in a sippy cup which she seems to like - I dilute it hugely, less than 1oz and the remaining bottle topped up with water (to about 5oz level) - is this ok?
Some say "no juices at all", some say "has to be diluted fruit juice not cordial" so not sure if I'm doing wrong - she's just getting teeth through so I know it'll be important to clean them properly.
She does have water too, but seems to drink more if its flavoured slightly and I feel happier if she drinks more fluids than less as she's dropping some milk feeds now she's on food.
x