In Science today we were using Vinegar, Baking Soda. Water and Citric aced at Science, also we used one tea spoon one Table spoon a empty beer bottle and a to small cups. (same size)It was fun because there was Chemical Reactions. e.g A empty beer bottle 3/4 fill, get a balloon and stretch it (don't break it) put one tea spoon of Baking Soda and one tea spoon of Citric Aced. Put the (carefully) on the top of the bottle lift the balloon up, the Baking Soda and Citric Aced should full down to the water there should be a chemical reaction, the balloon should blow up a bit and it will stay up. Until you take the balloon off.