How to Actually Clean a Water Bottle, Kids' Bottles Included
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Why bottles get grubby faster than you'd think, trapped moisture + body-temperature warmth is a comfortable environment for bacteria and mould; a quick rinse under the tap doesn't reach it.
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The daily habit, hot water and washing-up liquid, every part, every day, not just a rinse. Empty and air out overnight rather than leaving it sealed.
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Kids' bottles need extra care, straws, valves and spouts should come apart for washing; a bottle brush (and a thin straw brush) gets into the parts fingers can't reach. Check valves for a musty smell, a common sign something's growing in there.
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The weekly deep clean, for everyone, a warm water and white vinegar (or diluted bicarbonate of soda) soak loosens residue a normal wash misses; rinse well and leave to air dry fully upside down rather than sealing it away damp.
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Older bottles and grown-ups aren't off the hook, insulated/stainless steel flasks often aren't dishwasher-safe; hand wash and check the seal and rim, which get overlooked more than any other part.
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When it's time to replace, not just clean, a cracked seal, staining or a smell that won't shift after a proper clean is a sign to retire the bottle rather than keep washing it.
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You already take the time to filter what goes in the bottle, give the bottle itself the same care." Read/check your fridge filter → shop the right replacement.