There are two kinds of water wetter .
Premix and not premix
https://www.hayabusa.org/forum/gen-ii-busa-information/127074-genii-coolant-change.html
This is what I used and how I did it .
If you do not get premix than mix 50/50 with distilled water but don't mix coolant , water wetter and water all together as you only need one or the other coolant wise .
Supposed to take 2.9 qts but from the bottle you see I got all of one in and that much from second one in .
Not sure what 'hallet' is but if it's a track they most likely will want you to have a
Non-GLYCOL based coolant so you will have to go with water wetter or engine ice.
I got the stuff I used at Cycle Gear local store .
If your not that concerned with seeing nice pink fluid in bottle when your done then don't flush it more than one or two times .
Me , I went the extra time and made sure all green coolant was out before I put in new pink Water wetter.
Make sure after you get it done you open coolant bleeder valve and see coolant come out .
When you crack it loose , just turn it a bit .
Air will either escape out or coolant .
Time consuming process but fairly simple .
Let me know if I can help anymore .