I've compiled a list of my favorite supplies to help you build your watercolor kits. You will need a pallette, paper, brushes, and paint. (A few projects also require a good pencil set and transfer paper). My favorite brand of watercolors is M. Graham, but I've also used paint from Windsor and Newton and from Utretch. This list includes brands that I use and trust, but feel free to try other products. Just make sure that you purchase only professional-quality watercolor paints. The pigments react differently than cheaper student sets and I promise that you will see a difference in your paintings if you use high quality supplies.
Brushes: Set: http://amzn.to/2xOtYwc
Small brush: http://amzn.to/2wjvk43
Medium brush: http://amzn.to/2vUBlkx
Paint: Basic color set: http://amzn.to/2vuTr0R
Lamp Black: http://amzn.to/2wlI0Yd
Quinacridone Violet: http://amzn.to/2xAS7Hj
Burnt Umber: http://amzn.to/2vuR2Uh
Quinacridone Rose: http://amzn.to/2wlWNlR
Pencil/Eraser/Sharpener Set: http://amzn.to/2wT36OM
Transfer Paper: http://amzn.to/2wTkkvD
If any of these links are out of stock you can also check here: https://www.dickblick.com/
PS: I get a small commission if you purchase anything from these links. Thanks for your support!