i've had hypersalivation from before surgery , if i go out now i have 2 or 3 plastic pottles (urine sample ones are good size) , i covered the sides in black tape so you cant see whats in it. found its easier to reasonably quietly be able to spit into those screw the lid back on and in your pocket before you know it, rather than heading off to the toilets / washroom every 5 minutes.