There is alot of room for human error when making your own formula, which doesnt happen with mass produced formula brands. Alot of the ingredients are powdered nutrients that look very similar and you could easily mix them up, putting in too much of one and not enough of another etc. Also I imagine making your own formula would be very expensive even when compared to buying ready to feed formula. You need about 20+ different ingredients that you would have to get from specialist online stockists, so if you run out of any formula ingredients it could take a week or more to be able to replenish them. I would just stick to buying formula. Its one of the few things where DIY varieties are not the better (or even a safe) option. xxx