[quote=timo
Freezing won't be a problem as long as you leave room for expansion,ie:don't fill it all the way up to the brim.
[/quote]

+1 - water expands about 10% when it turns to ice (more specific, density of ice is 9% of water). Leave more than 10% air volume and you should be OK.

I would also pay a little attention to the shape of the container. I have a vague idea about freezing water sort of shapes its way around obstacles, but I wouldn't put to much confidence into it. I do feel less comfortable if the water is in danger of freezing in a container with lots of weird kinks and turns. Such as hollow handles on some cans.