Last reviewed: 8 November 2026
Start with the product and current local advice
Read the exact formula package and follow its preparation, water and storage instructions. Check whether the water supplier or local authority has a current notice affecting your source.
If you use a private well, tanker or stored water, ask the local authority or a qualified laboratory whether testing is appropriate. Do not assume that water from a filter, bottle or nearby home is suitable for your situation.
Ask the baby’s doctor about individual needs
Contact a pediatrician, doctor or qualified health professional if you are unsure which water or preparation method is appropriate, especially when the baby has specific care needs or local advice is unclear.
Do not change the amount of water or formula powder, use homemade substitutes, or improvise a treatment. Follow the package and clinician’s instructions.
Do not treat boiling as a universal solution
Follow current local instructions if they advise boiling for a microbial concern. Boiling does not remove fuel, toxic chemicals, salts or other dissolved substances. If chemical contamination may be involved, ask the authority and doctor what source and preparation steps to use.
Do not guess chlorine-tablet doses or use a household filter unless its purpose and suitability for the concern are established.
Prepare and store formula exactly as directed
Use clean hands and equipment and follow the formula maker’s directions for preparation, cooling, storage and use. Avoid relying on general online timings when the package or health professional gives specific instructions.
If you have a question about a prepared feed or the baby’s feeding, contact a doctor or qualified health professional promptly.
Frequently asked questions
Can I use filtered water for infant formula?
Do not assume every filter or source is suitable. Follow the formula instructions and ask the baby’s doctor or local authority about your specific water and system.
Should I boil water for every bottle?
Follow current local health advice and the formula instructions. Boiling is not a universal treatment and does not remove chemical contamination.
Who should I ask if my tap water has a notice?
Contact the local water authority and the baby’s doctor or qualified health professional for instructions that fit the source and the formula.
Can I change the water-to-powder ratio?
Do not change the package directions unless a qualified health professional specifically instructs you to do so.
Sources and further guidance
Related water guides
- How can I tell if tap water is safe to drink?
Check the supply source, local notices and a recent test of the water you actually use. Appearance alone cannot confirm safety.
- How can I store household water safely in summer?
Start with water from a source or treatment you trust, then protect it with a clean, closed container and careful handling.
- Boiling, filters or chlorine tablets: what is the difference?
These methods do different jobs. Choose only after considering the suspected problem, local advice and the exact treatment instructions.
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