The only way I could see there being a lot of water is if you overwatered your plants constantly, or were using a DWC in a really hot tent and a lot of the moisture evaporates off but I find my tent is quite the opposite, should be ideal to make the girls sweat as much resin possible during flower. There is really no other indoor alternative that I can think of apart from DIY cupboards. If you really did have a lot of moisture, you could always invest in a dehumidifier. Definitely go for a tent mate.