Mixol tints and/or Trans-Tint dyes can be disolved in water or DNA. For best results, in my opinion, use DNA as it is non grain-raising.
Always seal the wood first with a wash coat of 1/2# cut super blonde dewaxed shellac before tinting. This helps to even penetration of the pigment.
I prefer Mixol. It comes in 24 colors, including many wood tones and primary colors, and blend well, for a pretty much unlimited range of colors and depth.
You can find it at woodcraft.