MIC test with tubes

Not knowing what should be done to solve the mysteric contamination in microplate MIC test, I decide to change the test a bit - do the test with tubes rather than with microplate. Unlike microplate methods, I can't use 8-channel pipette and hence I have to add broth and honey, serial dilute the honey and inoculate cultures to each tube one by one with single pipette. It also use up much more honey and broth than microplate edition. It's indeed tiring, but whatelse can I do with MIC test?