Don't combine SN with drowning. The water will dilute the SN and make it useless. The only reasons why people fail SN is because they either don't follow the regimen closely enough or they aren't careful enough. If you follow the regimen carefully, because its your ctb that is on the line, I guarantee you that you'll succeed. You only need an antiemetic, painkillers, SN, a private place and if possible, benzos. Thats all.