Now here's a clever idea! Trays that make long and narrow ice cubes that we can easily slip through the narrow neck of a water bottle. Pretty nifty, don't you think?
We were undecided about these trays at first. We normally just freeze a little water right in our bottle the night before, and this works to keep our water cold for hours.
But then we remembered two things: 1) how often we forget to freeze our water bottles ahead of time, and 2) that many re-usable water bottles aren't designed to have liquids frozen directly inside them. Plus, the ice cubes made in these trays can certainly be used to chill regular beverages as well!
Ultimately, we'd definitely pick a tray or two up if we saw them in a store or needed to round out an Amazon order (to get the free shipping, you know!).
What do you think?
Get This Product! Water Bottle Ice Trays, $5.78 from Amazon.com
Related: Are You Drinking Enough Water? Ways to Make Water More Appetizing
(Image: Amazon.com)
Elizabeth Apron fro...

Ikea makes these, too, and I think they are only $1. However, it's almost impossible to pry the ice out of the trays intact.
I have to second angelala, it's a task getting them out of the tray, I finally got rid of the one I had!
I thought they were cool too... until I bought a pair. They were nice for a little while, but soon got old. Keeping the trays filled was a hassle (yeah the auto-icemaker has me spoiled) and if they spilled in your freezer... that's just too bad.
If you don't mind the mess and hassle, they work just like advertised, or you can buy a larger mouth bottle (which became my solution). Whichever works for you.
Or you can just not fill your regular ice cube trays to the rim. But, you know, introduce more plastic into your life, if you like.
I bought one of the trays that ikea sells for this. I honestly never had any problems popping them out. The tray is made of silicone, so it's pliable. And the skinny "cubes" aren't cylindrical or rectangular. They are more shaped like a wedge, so it was easier to pop them out of the tray.
I bought my boyfriend and me a Sigg bottle and a Klean Kanteen. The cubes were perfect for his Sigg, which had a smaller opening. But, we started to get lazy and stopped worrying about the ice. Now, we just fill our bottles up at night and put them in the fridge. With the metal bottles, it helps keep that cold water cool for much longer.
We have water bottles with wide mouths. I use regular ice cubes in them.
I've had the Ikea versions of these for a while, and they're handy for freezing stock and demi glace-- I break the cubes out and keep then in a jar or bag, using one or two or just a half or quarter, depending on what I need: they're easy to break.
If you have a good vacuum-type stainless steel bottle, you don't need to add ice as the water stays cool for a long time. I can leave my Thermos water bottle in the sun for hours, the outside will be very hot, but the water inside will still be cold.
Third..
I bought them, but between hoping they didn't turn over before freezing and prying them out of the tray, it's not worth it. I bought a wide mouth water bottle that will hold regular size ice cubes.
Just fill a bottle of water 1/3 of the way. Freeze it. Then fill it the rest of the way. The water stays cold.
I think I have the same type shown in the pictures. I picked them up at an Asian grocery store and they were cheap. Less than $5 for 2, don't remember the exact price.
Since they're silicone removing the ice cubes are a cinch since the tray is pliable. I mainly use them for freezing stock and sauce since the form factor is easier to store and use like @salsa has mentioned.
Furthermore, they're pretty short and stack so they don't take much space in the freezer.