Have a question about measuring SN grams and water ML correctly, worried I might mess it up

[LASTUSER]

Hello, I am worried that I won't be able to measure the SN and water properly when I take it. What I've decided to do is to buy three 50 ML measuring cups for the water because I plan on having 2 back up cups of SN in case I throw up the first one and a digital kitchen scale to weigh the grams for the SN. Is this a correct plan to accurately measure the water and SN? Any advice would be very much appreciated, don't want to mess this up and die a painful death or become a vegetable.