Back in April, I declared that I was running out of shampoo. And I was. I started writing a follow up post a few times, to chronicle what was going on, each time a little surprised at how long the shampoo that was so near to running out was lasting.
About a week after the above mentioned post, I started a follow up post (that never was posted). In it I mentioned that my shower schedule had been up-ended, but in a desire to avoid using up the precious commodity and not to wash my hair more than once in a 24 hour period, I did things like water-only and conditioner-only. Water-only being a method where you scrub your scalp as you normally would, simply sans soap. Conditioner-only is where you scrub your scalp as you normally would, using conditioner only.
Things that helped me get by with this (as there is an adjustment period, where your scalp is used to a certain schedule and amount of oil-strippage due to washing and has to...adjust to the new regime) were: (1) the weekend and not worrying about it, (2) buns gather hair together, and tuck the drier ends next to the oiler scalp, helping the oils distribute naturally, (3) these methods do scrub the scalp of sebum build up.
That was about one week, stretching my shampoo supply well into May.