5 yr old system, 205' deep well, 15gpm, pressure tank.

I want to add an extended drip watering system, and water pressure is not enough to wash a car unless I use a special nozzle.

Would a water storage tank increase the water pressure?

Should it be installed before or after the pressure tank?

How big a tank - 500 gal? 1,000 gal?

Would have a fire dept hose connection, as we are rural. If a burn pile fire got out of control, current water pressure not enough to put it out.