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To be honest I'd try and not put water bottles on the front. Whilst I never had any ejections on a decent length test run they were pretty close to coming out. On the front it does also make the steering feel heavier.
Personally I quite liked the water bottles behind me and I carried 2.7 litres this year which I felt was perfect although it was a fairly cold and wet year. In the first year I carried 1.5 litres which I definitely did not think was enough. If I did it again I would try out a full frame bag and camel back.
One option if you've got a frame with circular tubing could be to put some water bottles on the seat stays.
Also how tall are you/what frame size will you be riding?
My forks will have bottle mounts on them, if I need, but wondering whether that's efficient or not. Not super easy to grab, for example. Will also be able to mount an extra bottle on the underside of the downtube, but a little worried about roadcrud coating that.
I need to make a proper kit list but currently planning on sleeping bag, bivvy, inflatable matt as being the main bulky items.
The rest of the stuff will be clothing, food and tools/spares.
Should I giving a shit about aerodynamics? My (limited) understanding is that frontal area matters the most, so a full framebag seems to make the most sense...