My BB200 tips in no particular order. I just bashed these out quickly so I might edit later when I think of some more.
If you think your goal is to not stop then make that intention right from the off.
Take the minimum kit you can to satisfy the rules. You will go straight through because it will be less comfortable to stop anyway.
It will hurt for a bit of it. Mileage may vary how long that "bit" is but it won't last forever and you will come through it. Don't be tempted to stop at that point, keep turning the peddles in your little bubble of pain as however slow you are going you are still going forward.
When you do stop have a plan. Think about what you are going to do and in what order. You want to minimise the "time elapsed/moving time" differential as much as possible.
Don't use stuff like gels for food if you aren't used to them. Most people's guts aren't used to that density of calories and often it doesn't agree with them. They suck anyway. Have real food to eat cause chewing on something makes you feel better, let alone getting the calories in you. Have a mixture of savoury and sweet. Find that thing that perks up your spirits. For me its Battenburg cake. I like to ride along biting chunks out of a whole one like a chocolate bar.
Research the route at least a bit. Know roughly how far in the big climbs are as well as the suspected hike-a-bike sections. Expect the hike-a-bike to be the worst you have ever encountered. The reality can only better from there. Also, if you are like me and need to regularly eat (I get something in me once an hour) try to get an idea of where you might touch civilisation in order to resupply but also try to think what time you might be going through those places. If it's not a Spar but a village shop expect it to be closed whatever time you get there. If you don't think that a resupply is on then accept it and just carry what you need to form the start. It will get lighter.
In terms of water, the route will 100% cross enough streams and rivers that it won't be an issue, although try to fill up just before it gets too dark to see the water.
Make sure you stay warm through the night. Take an extra layer etc, maybe some spare gloves if the weather looks sh1t.