If IKEA had an impulse buy section, the Plastis ice tray would be in it. You've seen it, it makes long ice tubes to slip into the not-so-wide mouths of reusable water bottles.
Instructable user trebuchet03 came up with this excellent improvement: wedging drinking straws into each tray creates a negative relief as the water freezes, and once frozen, the plastic straw is removed, leaving a perfect space through which you can suck through all sorts of tasty thirst-quenchers.
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