You have a few options for this but there are two easy ones:

1. Ogre Fork
2. Enabler Fork

I have the enabler fork from a previous build that allows bottle cages mounted to the side or Anything Cage. It is a real nice system to have, since I have the frame bag those bottle mounts are now gone. I do not carry much water when I commute, usually a stanley coffee mug and sometimes a kleen kanteeen stainless steel, or beer.

Also there is a mid-blade mount on each side of the fork on the inside and outside, the fork has a lot of options.