Have seen lots of posts about Vapur water bottles. What size do you find best for putting ice in from the parks? I have found these water bottles sweat a ton!! Is there something you can use around them to prevent that? Or is the sweating of the water bottle a nice cooling feature? I really don't want to put everything else I have into waterproof pouches just to use one of these though. Any other water bottle recommendation? The last times we went, we had a stroller. Having everyone carry their own things this time in drawstring backpacks.