Genuinely Leak-proof drink bottles by Ecococoon Australia.
The unique Cocoon cap has a one-way valve which means water will only flow when you suck on the spout. Once you stop sucking, the water flow will stop.
This also has the added bonus of stopping backwash from entering the bottle, keeping your bottle hygienically clean for longer. This means you can now safely share your leak-proof drink bottle with your tiny human without floaties in your drink 😎