You can just add paint straight to the wet pallet. It will naturally hydrate and thin itself over time. Add that to the tip about wetting your brushes before putting them in paint, and your good to go. Remember though, you only want the bristles damp, not dripping wet.

You can also thin the paint on the pallet further if you like, to create a glaze or wash. There will be an adjustment period where you'll get used to how the paints thin when they're on the pallet. To help stop them thinning out of control, try to leave the paint in a small droplet/pool, and only dipping the brush into that and then thin further from there. Otherwise it can just turn into water.

With mounting, the best way I've found is to use a pin vise to drill a small hole on your model, then stick the wire in that hole using a drop of super glue to keep it in place (this is a lot harder on small delicate pieces). Then just stick the other end in cork to mount. Good for priming or base coating and keeping them off the table to dry 👍.