We've have had the same problem with heat and lack of rain. Since April 1st rainfall has been about 30% of normal. I can use rain and aquarium water for the orchids but the gardens are costing a fortune with tap water. We have to pay for the water coming into the house and pay the same amount again for water going out because it is assumed that its going into the sewage system and has to be treated. Seriously considering having a cistern under the greenhouse when I build it.