Great British Divide

I am planning on riding the Great British Divide in July this year. The event is self supported around 2100KM and 80% off road. You have 2 weeks to complete the course

Foods and drink will obviously bought along the route as and when available. I have been speaking to Precision Hydration regarding salt and hydration. What else is there to think about, other supplements that will help me? There is only a limited amount of food I can physically carry with me, especially as the event is 2 weeks long