Hi!

I never gave Louis water this age...and haven't given Dylan any yet...from memory I started Louis when he started solids! He had a little cup that he learnt to drink from...so I think the cups start from 4 months...Louis hasn't ever had a bottle! I also started him with solids around 4 months though as well...
I'll probably do the same with Dylan - around 4-5 months...
Hope that helps!