Step 4- Heat Mats- there are several options for keeping the kombucha at a constant temperature. Here are my current choices.
Heat Mat
VIVOSUN Durable Waterproof Seedling Heat Mat Warm Hydroponic Heating Pad 3” x 20″ for Kombucha Tea & Beer Brewing, Fermentation, Seedlings & Plant Ge https://www.amazon.com/dp/B073PTZCJ4/ref=cm_sw_r_cp_apip_FhSzR7IWqjSsq
The Kit I started with
The Kombucha Shop Kombucha Brewing Kit with 1 Gallon Glass Brew Jar, Kombucha SCOBY and Starter Pouch, Temperature Gauge, pH Strips, Loose Leaf Tea an https://www.amazon.com/dp/B00LW7OR4A/ref=cm_sw_r_cp_apip_PgjwhnBZt2Lup