I have searched! But couldn't find any pics. I know many people use standard bottles for AI kits. I also have found a thread where the owner put another tank under the car. Also I am aware of the mechanical WI where it keeps the bottle in the engine bay. And finally I found threads where people talk about using the windshield washer tank but where are the pics?

I don't want to see the tank in the engine bay or the hatch. Does anyone have any other suggestions or write ups?

 

Credits and kudos to adamrs80, I used the stock washer tank similar to what he posted here (w/pictures): https://www.rx7club.com/auxiliary-injection-173/aem-water-injection-install-write-up-883642/ . Been pleased with the performance so far. I use an M5 nozzle on a boost activated system set at ~2 psi and depending on how I drive a tank of fluid seems to last quite a while.
FWIW I differed from adamrs80 in the pump mounting. I have dual oil coolers so I didn't have that empty space. Instead I fabbed a bracket with mounting studs for the CoolingMist pump and tack-welded it to the chassis 'frame' at an angle just under the steering shaft as it exits the firewall. Fits great, still lower than the tank and isn't in the way of anything. Sorry though, no pictures of that. If your interested I could maybe post some later this week when I put the car in the air again.

 

Thanks for the link!