stuffwithme:
Hi Liken,
Maxing out with a funnel definitively trains your capacity. For me it does not increase appetite, but the amount I can eat/drink in one sitting got way more.
You can try an alternative to funnelling which lets you get closer to your belly's maximum as you can stop easier: simply taking a short piece of hose, about 30cm but having a big diameter to chug quickly, and chug soup (salty, not just water) out of a big pot while standing.
This way I can chug 2 liters in one go, and a bit more than 7 liters in total in one evening, so it definitively trains capacity.
Do you mean drinking out of a pot using a tube like a straw?