easy enough....
fill buckets with tank water... catch all the fish and place in the buckets.
fill a few extra buckets... put filter media and half substrate into the next buckets. keep the substrate and filter media wet.
drain tank... scoop rest of substrate into more buckets...
break down tank... and move...
you DO NOT NEED THE WATER.... all the beneficial bacteria is in the substrate and filter media... make sure you keep it wet.
you will NOT need to re-cycle the tank... when you are setting it back up... add substrate all any water it was sitting in.... fill ur tank and dose with seachem prime or something else to remove chlorine and chloramine.... set up your filter... dump in fish with water they are traveling with... and done.
i have moved several tanks (45gal, 70gal and 90gal) this way multiple times with no issues.