Looks like Dash just announced a single bottle carrier on their facebook page. Doesn't appear to be up on their website yet though.

EDIT: It looks like it might require their seatpost too, in which case that's probably not a cost effective option.

Sup to you.... zip tying works just fine if you plan on leaving it on there for both training/racing. A saddle rail or seatpost mounted option would certainly be a bit sturdier, and much easier to take on/off if you don't want it on for races

I have a stock tri.7 saddle and I simply use 2 zip ties at the top of the cage around the flat carbon part at the rear of the seat and one or two around the bottom rails. Keep it super simple and just use tie straps. Just make sure they are slightly thicker ones. The cage will never be 100% stable but you can get it 90% tight where it won't move left or right. My favorite cage that has NEVER ejected a bottle is the Specialized rib cage.

Good luck.

Thanks for the suggestions! I'll look into that Specialized cage.

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