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That goes for a number of things that would / could be in a EDC / emergency / survival kit;Good idea to replace every year as you suggest...
Self-filled water bottles are only good for about 60 days. Any medications, perscription or OTC, should be inspected and changed out periodically. Food, meds, bandage, etc. packaging should be inspected and repackaged as appropriate. Open sterile products should be replaced or autoclaved and then repackaged. There's more, so look through you kits and figure it out.
As an example, I was once on a Strike Rescue training mission and got some bad bottled water in my survival vest. two days of the screamers, in flight gear, is no fun; trust me!