Thanks for the search request. Based on your keywords "humidifier water sterile 340ml", the first result is for a Beurer Refill Kit for the Maremed Sea Air Humidifier. This looks like it contains sterile water cartridges that would be a perfect replacement for your humidifier. Refill kits make it very convenient to continue using your humidifier without needing to find sterile water elsewhere. The Maremed is a trusted brand and this kit at R1199 would supply you with 6 months' worth of humidifier refills. Let me know if you need any other details on this product. I'm always happy to help with your searches.
