Sterilizing Dispenser

Soak in 70% alcohol, either ethyl alcohol or isopropyl
and allow it to evaporate.
That should kill virtually all bacteria and viruses there.

Without an autoclave you don't have many options.
An oven would melt the bottletop dispenser
and you can't use many other sanitizing fluids as they'd leave a potentially poisonous residue as they dry.
 
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