I used some generic windshield washer bottle. I picked it up at a swap meet for a buck. A couple fo OEM type screws and it looked like it was supposed to be on the core support.

68 Road Runner (383/4speed, post car w/decor pkg) - Major Project
69 Road Runner w/472 Hemi & 4 speed.
70 Challenger R/T SE EF8 w/ V9J, U - A32 - Major Project
2023 Ford Mach 1