One bucket with a lid and one kettle is all you need.
For example: I heat strike water in my kettle then mash in a Coleman Extreme cooler. At ~ 5 min to mash out I heat my mash out water in the same kettle. Then while I let the mash out have a 10 min rest I heat my batch sparge water in the same kettle 10*F higher than may sparge water temp target. I pour my sparge water into a bottling bucket and cover with a lid to hold while I lauter my first run into the same kettle. Once the first run is complete, I use the sparge water - which is now at my sparge temp - from the bottling bucket to batch sparge. I lauter the sparge and begin the boil.
Cheap and Easy.
Sent from my iPhone using Home Brew