Instruction: Given a question and the related document, and generate the answer to the question based on the information provided in the document.

Input:
Question: What is the exact amount of water to pour into these molds to attain a crack-free ice ball?
Document: Ok, these ice ball makers are great. I'm still working out the exact amount of water to pour in to make perfectly round balls, but I'll get there. It would have been nice if the makers of these molds had stated the amount, but, that doesn't detract from the fact that these molds make really nice balls. These blue balls make great ice balls, and fantastic conversation starters. Sort of 'ice breakers' if you will.
this is my first set of ice ball molds i've ever owned but they work great. getting the right amount of water in there is gonna take some practice, but aside from that i would recommend them to anyone. easy to get out and clean up.
I recently used the Arctic Chill - Ice Ball Maker Molds for the first time. I was having a super bowl party and making margaritas. These worked wonders! Usually regular cubes melt quick and water down the drink. These lasted hours and hours! Everyone also complemented how cool the round cubes looked in the pitcher. They were easy to use and I love that they are BPA free and can be thrown in the dishwasher. I will be recommending these to all my friends!!! LOVE IT!! !
Arctic Chill's ice ball maker is made from BPA free silicone, it has a flat bottom so it sits flat in your freezer, that way none of the water leaks out of the opening on the top that you use to fill the molds. The first time I used them I think I put too much water in the mold and when it froze the spheres expanded and pushed some water through the opening and that froze as well but it wasn't that much and I just chipped it off before using the spheres. They do also have some rough edges but that doesn't bother me as soon as they hit the drink they are gone.
We were at a very expensive restaurant in Hawaii where they use ice spheres like these in the alcohol drinks. It was such a hoot we ordered these when we got back. We have not mastered putting the exact right amount of water in to get just a perfect sphere yet. We usually end up with a little button on top as the expanding ice just protrudes through the fill hole, or a little icicle if it runs down the side. But that is half the fun of these, the challenge to get it just right.
The silicone molds are sturdy, seal well, don't leak, and make a nice sized ice ball. Less a product flaw, and more a design flaw: no matter how you fill the molds the ice balls crack readily either as you drop them into the glass or as you add liquid. There is no spherical splendor as pictured in the product images.
These ice ball molds make really great big ice balls for my drinks. At first, the balls were cracking and I didn't know what was causing it. Busted balls are no fun. However, when I put a wedge of lemon or lime, they didn't crack at all. Plus, the wedges make everything taste better. The molds are very soft on the top half which makes it easier to remove. The bottom is a little more solid so it is a little harder to get the ball out, but a little practice helps.
By request, I tried out the arctic spheres and posted about them on my cooking blog. I absolutely loved them! The molds are easily to clean and are BPA-free. You simply fill them with fresh water and freeze; the molds have a flat bottom so they sit nicely on a freezer shelf. The ice spheres themselves last a long time. I'd recommend them for Scotch or bourbon, and for martini-type drinks that you don't want watered down quickly. The arctic spheres would be great stocking stuffers![...]
So I have only tried freezing these 4 once and here was the result.3 filled with no problem and each of them made a frozen ball that cracked.These 3 looked more like a peach shape given the crack...  or maybe an ice butt. Lol.I have had 2 in my drink for half an hour and despite the cracks they are still in one piece so kinda cool.The 3rd one leaked around the crease but apparently letting the water out allowed it to form a shape without a crack.It is a sphere minus the top 10-15%.
Full disclosure: I received these ice ball makers for free to review on my blog. Blog post can be found here: [...]An order of Arctic Chill ice ball makers will give you four blue BPA-free silicone molds, each with a top half and a bottom half. The bottom half is thicker so as to maintain the integrity of the sphere while also being flat on the bottom for easy freezer storage. The top half has a small hole for filling the molds. Obviously, to get the ice ball out, simply split the silicone mold in half and pop it out!There are so many fun ways to use these molds...freezing lemonade to put in iced tea, freezing ice balls with raspberries or lemon slices for cocktails, filling up ice chests at parties or weddings...the list goes on!It takes less than 90 seconds to fill up the four molds and pop them in the freezer, and then just a few hours before they're frozen through.
Answer: I never actually measured the amount I put in.  I fill them up and pour some out.  Sometimes the balls crack, but I've never had one crack apart.  I use filtered water.  Maybe that might make a difference.