if you want to be historically accurate to the operant conditioning literature you could give yourself a sip of some sugar water—perhaps 20% sucrose to water—as your primary reinforcer. drinking it out of one of those water bottles with the sippy tube for extra accuracy
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For a friend
https://wonderlandrecipes.com/2018/10/04/scooby-snacks-caramelized-honey-graham-crackers/?srsltid=AfmBOoo-ZHYE52ezHUlxzYK_HMPQmGiLENzYrs4JsYX9UVADFwHTk738
a tictac, or a singular jujube, or a cracker or a piece of cheese
I can give you my current methodology if you like but it involves playing a bunch of runescape
reward needs to be easily and quickly given!