(1) If this study about the polio vaccine has been proven to be true, and there are, in reality, such ingredients included in it that are unlawful as per Shari’ah and harmful to one’s health, then in that case, it would be Haram to use these vaccines and work in any such medical department that issues them. If this is not the case, then the usage of these vaccines would permissible and there would be no problem in working for any such medical department that issues them.
(2) Reciting Quranic verses etc. and blowing it into water or milk and then pouring it into a well to make its water sweet is permissible.
And Allah knows best.