I added a sink sprayer to our toilet. The first time I did it I tried to take the easy way out and use those 'push to connect' fittings. I always get burned and I don't know why I keep trying these things. They always leak.
This photo shows the leaker.
This photo shows the 'redo' using all pex crimp connections. I had to unscrew the fitting from the back of the toilet and the crimper barely fit behind the toilet, but it's a much better job and a heck of a lot cheaper than the kit they sell for this. Plus I already had the sprayer. I wanted a shutoff in case the spray head goes bad.
I mounted the sprayer to the side of the vanity with the shower head holder that I removed when I put in the better shower head.
Hopefully this helps someone thinking of doing this mod.