tap water contains minerals, which can damage the battery. or perhaps, you just have a big cleanup task to do and you require a place to get rid of all the spend. the thought was to turn it into a family playground and entertainment space. “channel” them into a positive so they don’t control your day. but most of all, she keeps thanking me over and over again - and it's been 6 weeks since she received them!!! my favorite item is the bedding our mother-in-law sewed for us. we don't naturally want to kill anything. - bottle, sleeve and cap are dishwasher safe. 