We just had my granddaughter's 6 year birthday party this past Saturday they told us no balloons no water balloons no water guns no squirt guns no water anyting and they told us if we wanted to rent a bounce house or a bouncy castle that we would have to go through them to find out what company they allowed to come in so you need to get in contact with them check out their website
Some areas will have them, others will not
Some of the shelters have water hook up, but I don't think they allow you to use them in that way. You need to call them.
City would be the best help with that.
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