Plein Air Acrylics
I have noted in red the links to some websites where I buy my supplies
I strongly recommend artist grade paints like Liquitex or Golden, heavy body. If you want the paint to stay wet longer use Golden Open Acrylics.
Azo Yellow or Hansa Yellow or Cadmium Yellow
Indian Yellow or Cadmium Yellow Deep
Naftol Red or Cadmium Red
Quinacridone Violet or Quinacridone Rose or Alizarin Crimson Permanent
Phthalo Blue or Cobalt Blue or Cerulean Blue
You will need a field easel for plein air painting.
You can explore some on the blick website. Keep in mind that some options don't offer you a space to put your palette, so you will need to add a side table or hold your palette with your hand. Most people prefer a light easel so it is easy to carry around. Just keep in mind that if it is too light, it will not be stable in a windy day.
The Masterson Sta-wet premier palette comes with a sponge and paper sheets to preserve the freshness of acrylics. Additionally you can use a spray bottle to add a mist of water from time to time to your palette.
In my workshop I suggest you bring one panel per day for a finished work, and optionally another panel per day just in case you want to do a quick sketch or an additional work. I recommend sizes between 9x12" and 12x16"
You can adapt this suggestions to your preferences, using smaller or larger sizes, doing more or less sketches and finished works. That depends a lot on your experience and if you work fast or not.
Any panel is good for quick sketches and studies but if you want some good quality panels, I recommend Raymarart panels. They have very good and expensive Linen canvases but I find that their portrait cotton canvas panels are a great quality for a reasonable price.
You will need also some panel carrier, I recommend the ones from Raymarat or from Panelpak
RAYMARART CANVAS PANELS AND CARRIERS:
RAYMARART PANELS IN THE BLICK WEBSITE: https://www.dickblick.com/products/raymar-23sc-smooth-portrait-canvas-panels/
PANELPAK CARRIER: http://www.panelpak.com/
MY BASIC BRUSHES:
I work mainly with Silver Bristlon Synthetic Brushes, flats. It is a personal preference and I think you should experiment also with other types to see what works best for you.
Silver Brush Bristlon Flat
2 brushes size 2 (I use this size for detail)
4 brushes size 6 (This is the size I use the most)
IVORY SOAP to clean brushes
PLASTIC CUP FOR WATER
METALLIC PALETTE KNIFE
I recommend to have at least one, small size and optionally a large size.
RAGS OR PAPER TOWELS