I think you are talking about peaches.... lol
I keep looking into this more and it seems the basic idea is that everything will eventually be dispensed in some form of mg, mL or grams, i.e.
So, when you write for albuterol 0.083%, take on neb treatment q3 to q4 hours prn cough/S.O.B. -- Dispense ____________
I used to just put two boxes. But the albuterol packets comes 20 to a box and 25 to a box, etc. So, they will give you the small box. But, what will happen and I am already doing it (worried the pharmacist won't figure it out) is the the box of 25 contains 25 packets of albuterol 2.5 mg/3mL. So you would order in mLs. So say you want two boxes of 25, it would be. 50 times 3 mLs or 150 mLs.
You can put tablespoon because that unit is looked at as 15 mLs (although it is lower). An ounce would be 30 mLs so 4 ounces would be 120 milliliters. MiraLax would be 527 grams. Proair comes in 6.7 grams and 8.5 grams so dispense 8.5 grams or you get the small one which would be unspecified. Pharmacy comments. Ventolin can come in an 18 mg. If you wrote Proair dispense 18 mg you would get a phone call or less mgs.
A gallon, because it is equal to 3785.411784 milliliters, you just multiple the number of gallons you wish to prescribe and multiply by 3840 mLs. It is all very simple.