My main tools I use for painting with watercolors.
The list of the colors currently in the set (Schmincke Horadam catalog numbers):
221, 229, 230, 215, 224, 209, 217, 213, 220, 214, 218, 361, 349, 363, 366, 353, 354, 369, 474, 495, 494, 482, 485, 787, 480, 499, 481, 484, 509, 510, 475, 528, 519, 536, 525, 524, 530, 512, 534, 521, 533, 784, 657, 655, 660, 654, 661, 649, 670, 370, 645, 782, 668, 669, 663, 780, 031
and additionally: Daler-Rowney 417, Holbein W097
With all these colors on hand, I have what I think is a very versatile and well balanced set that is fit for my style of painting - usually I try to use the colors with as little mixing as I can (I also paint my comics with this set so I want the colors to be consistent and easy to get).
Schimincke Horadam series are overall really high quality professional paints with high pigment concentration. The set contains though a lot of opaque colors (I don’t mind this actually but some of you might). This brand is really popular in Japan and it’s easy to buy replacement colors, this is also a reason why it’s my primary set.
It's a perfect match for the Mijello Mission Gold Pure Pigments set I have, that consists of 25 colors if you ignore the white. The Pure Pigments paints are all single pigment colors and provide excellent saturation, which is useful when painting simple sketches. Because of that, I have been using the Mijello paints more and more recently as I'm aiming for a more loose style in my paintings. I quite enjoy painting with them, and I did not have any problems - except them being runnier than Schmincke or Holbein, so you have to be careful about how you store your palettes.
I use a lot of brushes and my favorites change a lot, but I can recommend some of the best:
ARTETJE Aquarelliste 990 mop brushes size 10 & 12
Great, inexpensive artificial hair mop brushes that can hold a lot of water and paint and have a nice, sharp tip at the same time.
Raphael 8402 KOLINSKY size 3
Brush made from the famous Kolinsky brand natural hair - probably the best hair for watercolor brushes. Has a sharp tip and can release water and pigment steadily. I used this brush a lot even for the smaller details. The downside is the high price.
Raphael SoftAqua 845 size 6, 8, 10 and 12
These artificial hair brushes are made to imitate the petit-gris squirrel fur. They work great - hold water and pigment well, release them steadily and have a sharp point. These brushes offer a good quality and inexpensive alternative to the natural fur brushes.
Though the maker doesn’t recommend mixing this white with other paints I sometimes use it to make watercolors more opaque to paint like I was using gauche.
NICKER white Poster Colour
The industry standard for painting anime backgrounds are the NIKKER Poster colour paints. Relatively cheap, opaque, highly pigmented paints similar to gouache. I rarely use these poster colors to paint (I prefer acrylic gouache for opaque paint painting) I use the white paint with watercolors similarly to the above Bleed Proof White.