R: 0; T: self; D: [dice] days
Your stomach becomes a massive pit, with a capacity of [sum] inventory slots. For the duration, anything you can fit in your mouth can be swallowed and stored in your stomach. You can spend a Round to regurgitate a single slot worth of items. When the spell ends, all contents are harmlessly vomited back up.
For the duration of the spell, you cannot use your stomach the normal way, and cannot benefit from or be harmed by eating or drinking anything. For durations of 3 days or more, deprivation may become a serious issue.