What are the “must haves” in Watercolor supplies?

I’ve been painting in watercolors nearly 20 years now and I continue to experiment with various products.  Yet, I do have some absolute staples that are always in my art supplies.  My students, at Joyful Arts Studio, often ask me, 'What are the "must haves" in watercolor supplies?"    My first and foremost must have…

Japanese Artist Grade Watercolor Paint Set Beginner Watercolor Set 12 Basic Colors

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46 Pack Watercolor Paint Set, 36 Colors Watercolor Pan with 10 Brushes Kit, Easy to Blend Colors, Perfect for Kids, Adults and Beginner Artists by Smart Color Art : Arts, Crafts & Sewing

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Watercoloring Supplies for Beginners — Kapowder Ink

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MozArt Supplies Watercolor Paint Essential Set - 24 Vibrant Colors - Lightweight and Portable - Perfect for Budding Hobbyists and Professional Artists - Water Colors Paint Adult Set With Paintbrush

Facts About Fabriano Watercolor Papers

46 Pack Watercolor Paint Set, 36 Colors Watercolor Pan with 10 Brushes Kit, Easy to Blend Colors, Perfect for Kids, Adults and Beginner Artists by Smart Color Art : Arts, Crafts & Sewing