[Motor31]

When I drain and flush the water heater annually (to remove scale, check the anode and clean it out) I have to refill it. Once the plug and anode rod are back in place I open the valve in the back to allow water to flow into the heater. The relief valve is propped open and when water starts to come out of it I shut it. I again turn the inflow valve off and reopen the safety relief valve (top outside spigot looking gizmo) to allow a bit of water to come out. Once that is closed again there is now plenty of air in the tank to prevent dribbles as it heats up.

If the dribbles are coming from the bottom opening plug that's a different story. You just have a leak that needs attending to then. I use plumbers sealant putty ( comes in a small tube and used on water and gas lines) rather than teflon tape there.