Lena have you tried to use a container instead of fully wetting the mattress?
Of course a helper could drink it before it ever touched a feather and not one drop would spill on the sheets, but you have so many container options as well, and there is nothing stopping you using these but what would you do with it that could give you the same feeling? i think you have so many options what are you thinking would be right for you?
PS this might sound random but have you had any dreams that might help, like names or people dreaming of you and things happening? Perhaps you are unsure of wha