There used to be a thread about adding braze-ons, somewhere in the archive here. Someone knew how to drill a hole in the fork and add bosses.
Is this the correct part¿
http://www.paragonmachineworks.com/frame-building-parts/miscellaneous/ms2033-steel-fork-boss.htmlParagon steel fork boss?
The back provides a little extra safety for your cargo, and is just a tad more aerodynamic, and slightly better balance, and just a smidge better for steering.
A broken bottle cage on the back of the fork can can lock up the front wheel and send you over the bars.
Bottle size on the back is limited by frame size.
On the front you can have a bigger bottle. Weight on the front is a touch harder to steer. On the front, your bag hits the rock or thorn bush first, whats in the bag, something you need.
A smidge and a touch is what 1% or some small thing few would even notice.
Decide this way. Figure out what the cargo is. Then see where it fits.
Close to the fork rides better.
Figure out how to mount your load close to the fork. A few mm out does make a noticeable pull on the steering.
4 water bottles on the fork sounds better than 2. I will take the rear mount first, back of the fork that is.
Maybe someone remembers where the old thread about adding bosses is.
Mounting points on the front and back is a step in the right direction.
Drilling a hole and getting the cargo closer to the fork would be better than an outboard mounting, for better steering.
Here is a hose clamp cage if your cargo is a 1 liter water bottle,
https://salsacycles.com/components/category/accessories/nickless_cageNot the only cage with ports for a hose clamp.
I have seen bikes with water bottles mounted at the rear axle. My attempt failed, I ended up with broken bottle cages after about 200 miles.
As long as we are on the subject, who knows how to mount a couple of water bottles on the back of the bike?