Thank you for your medical query at AskTheDoctor.com
I understand your concern.
No, it can't be mixed with paternal drug sterile water. In the ideal scenario, it can be mixed with tap water provided the concentration of the fluoride is fine in the tap water.
The mineral water or other house water sources remove the fluoride level which may not be ideal, but can be used safely for the baby. The paternal drug sterile water may cause gastric irritation for the baby, hence, it should be avoided.
So, kindly stick to the plain water or tap water with low fluoride count.
Hope this was helpful,
Feel free to discuss further,
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