I like TOA SuperShield and TOA Contact Primer.
I use "SuperShield" undiluted, and I generally do not dilute water base paint, but if I did, I would follow the manufacturer's instructions on the can like I would any paint.
The "Contact Primer" is clear, is solvent based, it does not need thinning, it provides great coverage, it is reasonably priced (for a premium product) it sticks to anything, it will stop any bleed-through, it lays down nice, dries quick and does not even need stirring. The only bummer is that it is clear so it can be hard to see where you've painted.
IA good paint job is 90% preparation and 10% application.