Can someone induce cancer in another person
[&hellip;] So the question is, could this person poison the bottles to make others get cancer? Or another highly dangerous disease?


Yes, in principle. 

Information on known cancerogenic compounds can be found in CMR (Canceogenic, Mutagenic and toxic to Reproduction) lists published by national organizations responsible for workplace safety. 

In Germany, this would be the IFA (Institut für Arbeitsschutz der Deutschen Gesetzlichen Unfallversicherung).

List with old nomenclature

List with new nomenclature

I have added these lists just for the sake of completeness!

If you suspect any of the activities that you described, contact the local authorities.