Here's a quick tip ... which can be considered to be frugal and save money on watercolor paint. Squeeze fresh from the tube paint into the wells of a watercolor palette. Use a palette knife to stir and level out the paints. Then tap the palette a bunch of times on your table top, to get the bubbles to rise to the top in the more fluid colors. Place your palette in a warm, dry relatively dust free and out of reach of pets place ... such as the top of your refrigerator.
Tube paints allowed to dry in a palette will last longer than using the paint fresh from the tube. There will be less waste. It is super easy to swipe a clean brush filled with water across the top to clean up a dirtied color. If you dirty up color squeezed from the tube, you will need to squeeze more out from the tube if you want fresh clean color. The tube paints dried in your own palette free up easier than pan paints with the swipe of a wet brush or spritz with a little clean water for some brands.
It will take about a week for the paint to dry up and be ready to use, depending on humidity. This way you can create your own palette of colors.