@temporal_spider I second the recommendation for water brushes. Squeezing them just the right amount to get the brush wet without dripping takes a bit of practice, but is totally do-able.
There are a bunch of great watercolor pan sets that are a step up from supermarket, but are still quite inexpensive.
What I've done is start with a small, cheap Sakura Koi travel set and as the colors ran out, I've refilled with nice tubes. When the tube paint dries, it works just like the pans - wet and use!
@temporal_spider Here's my current setup. I use this for all of my art. Koi travel set. Cheap synthetic brushes. Very compact.
Expensive tube paints normally not out, but shown as example - I only have to refill every couple months, if that.
A water cup can be glued to a piece of board or cardboard to make spills less likely. This is our little secret, but I just do a quick rinse on my cup and brushes after use. It's fine. Synthetic is very forgiving.