DS is having a school event tomorrow morning, and some of the parents and I are supposed to bring in filled h20 balloons. Do you think the water balloons would last through tomorow morning if I fill them up w/ water tonight? Thank you in advance! I tried googling this, and it seems like the balloons would last overnight if I do fill them up w/ water a night in advance. Just wanted to double check this w/ the BBB, since I have about 35 balloons to fill and would rather not fill them up during the hectic morning routine. Thanks!