Tap water. It's pretty good, PPM out the tap is about 100. MicroGro nutrients, blurple LED light from Amazon. 5 Gallon DWC bucket, using an airstone. Temp and humidity monitored.
Took the nutes to 500ppm (in addition to the base tap water ppm). The plant is 3 weeks old. Just using the Micro Gro (nothing else)... Will switch to Micro Bloom once it starts to flower.