This list has been compiled over years of landscape painting. Don’t go bankrupt trying to get everything on the list.It is given as a framework for what to bring. Your list may vary.
For Oil Painting and or Acrylic or Open (Slow Drying) Acrylic
One small set (at least 12) of oil colors, or acrylics
One tube of titanium white
Other colors to add, if you like:
Alizarin crimson
Cadmium yellow hue
Cadmium red hue
Cadmium orange hue
Dioxazine purple
Ultramarine blue
Phthalo green
Phthalo blue
Lamp black
Sap Green
Payne’s Gray
Earth colors
Burnt sienna
Burnt umber
Raw sienna
Raw umber
Yellow ochre
Naples yellow
Brushes: white nylon flats – 1 inch, ½ inch, ¼ inch, at least two of each
Rags – paper towels/handy wipes
Palette knife
1 white charcoal pencil, General’s #558 is a good choice.
5 small canvas panels or wood or masonite, or heavy watercolor paper – 8 x 10, 9 x 12 or 11 x 14 inches, prepared with two thin coats of gesso primed with a toned or gray surface – this will be demonstrated if needed. If your canvas is pre-primed white, half your work is done one coat of gray paint is all that is needed.
Disposable palette or roll of butcher’s paper or freezer paper (at grocery store)
Other Supplies
Any type of lightweight easel for working in the field. A French folding easel is best, but not mandatory. The Julian French easel seems to work best.
Link:
https://www.dickblick.com/products/jullian-original-french-easel.
Poached Boxes are another option. https://www.judsonsart.com/collections/pochade-boxes but you will still need to carry a separate bag for your paint.
And there are many others that can be found by an Internet search for: outdoor painting easel
Think about bringing small amounts of water, food, sunscreen, insect repellent.
Consider working outside the way you would hiking, fishing, or camping. Travel light but travel right! Plein air painting is the Navy SEALs of art. Anything can happen while you were painting. Your mission is to adapt, adjust, and overcome.