I did a SN drill. I wanted to know what it felt like to drink something extremely salty. I put 20g of common salt in 50ml of water. First, the salt did not dissolve, it remained at the bottom, perhaps because there was little water to dissolve it. Second, I had a drink, very salty and it burned my throat. Then, I drank the second drink and immediately gagged, felt sick. I ran to the bathroom but I couldn't vomit, my stomach was empty because I hadn't eaten for almost two days.
It seems incredible to me that my SI was activated, I felt desperate to feel good again. I drank a lot of water and that helped me feel better from the nausea.
I felt all this drinking only 20g of salt (NaCl)... I think that's how it will be when I take the SN. Surely the feeling will be similar or worse.