What over the counter drug can you say you took too come up positive for cocaine?

No common ones, if they do it is very rare, drug tests can read false positives on their own and have a rate of failure differing by brand. Amoxicilin, an antibiotic for ear infections, can cause false positives for cocaine on very rare occasions (maybe not even statistically relevant occasions).

Amphetamines and opiates are much more common false positives and can come from weightloss aids, Vicks Nasal Spray, and even other antibiotics.