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No, boiling milk in an electric water kettle risks boil-overs, scorching, and damage; use a saucepan or dedicated heater instead.

No—most glass kettles are built for water, and milk scorches, foams, and can damage the appliance.

Yes, plain brewed coffee during a fasting window is fine; calories or sweeteners in the cup end the fast’s benefits.

Yes—boiling mineral water for tea is safe, but high minerals can mute flavor and leave scale.

Yes—boiling bottled mineral water in a kettle is safe for most uses, but it speeds up limescale and may nudge flavor.

Yes—the stovetop moka can brew everyday coffee, but grind, ratio, and heat control decide the taste.

Yes, heating water for tea in a microwave is workable, but use short bursts, a safe mug, and a stir to avoid superheating and uneven heat.

Yes, reboiling kettle water is safe when the water is potable; taste and scale—not toxins—are the real concerns.

Yes, most nursing parents can have coffee in moderation; keep total caffeine near 200–300 mg daily and watch your baby’s sleep and mood.