The supplies I use to vary from time to time but here are my favourites.
Most of my watercolours are done using my sakura koi watercolour pocket field sketch box. The set I have is the set of 24 colours, I probably don’t use all of them all the time but it’s nice to have the options. The set has enough space in it to include my colour test chart I created when I first got these paints (this is always a good thing to do when you get new paints, to test them out and see what the colours actually look like), there is also a little mixing pallet and the set does come with a waterbrush too. To begin with I used the water brush on every project with these paints, but now I just use whichever brushes are to hand since I changed my set up a bit. The water brush would definitely be useful for painting on the go though. I like this set due to it’s vibrancy, I’ve been using this set non stop for a couple of years now and have only just made a dent in my most used colours (Ultramarine blue of course) https://www.amazon.co.uk/KOI-Watercolors-Field-Box-Colors/dp/B001OVG40E/ref=sr_1_1?ie=UTF8&qid=1511629990&sr=8-1&keywords=sakura+koi+watercolor
Other sets I have include a winsor & newton one which is also nice I just haven’t got round to using it as much as I’d like yet and I have a set of Kuretake Gansai Tambi Japanese Watercolour Paints (36 Colour Set) These are very vibrant and come in a very pretty box. There are also interesting metallic colours in there.
The only set I have used so far is a Winsor & Newton set and I love it.
I love Liquitex basics acrylic paints. So far they are by far the best and easiest to use acrylics I have ever encountered.
I also use Fredrix canvas pads to paint on for my acrylic pieces, because they are flat they don’t take up the room that a stretched canvas would. https://www.amazon.co.uk/Fredrix-3500-Canvas-Pads-12-Inch/dp/B000YQEBPA/ref=sr_1_1?s=kitchen&ie=UTF8&qid=1511631185&sr=1-1&keywords=fredrix+canvas
Faber-Castell Polychromos and Caran D’ache Luminance are my go to pencils.
The paper I use is probably what can vary the most. I have a Dalery Rowney mixed media Sketchbook that I love to work in.
For landscapes I use winsor & newton cold pressed 140lb paper
For things with fine detail or coloured pencil pieces I prefer to use hotpressed paper. Most commonly Daler Rowney Aquafine smooth watercolour paper or Daler rowney Langton paper