1. fill 3 gl bkt 2. pour into 5 gl bkt 3. fill 3 gl bkt again 4. pour into the 5 gl bkt which already has 3 gl in it 5 this leaves 1 gl in the 3 gl bkt 6. dump out the 5 gl bkt 7. transfer the 1 gl thats in the 3 gl bkt into the 5 gl bkt. 8. fill 3 gl bkt. 9 transfer into the 5 gl bkt which has 1 gl in it I was close the first time but your procedure reminded me!! And yes i did see Die Hard movie where D. Gluber and Mel G. had to do this at a water fountain! LOL