A new house rule I'm implementing for this setting.
Wealth and Bookkeeping: A player character can be assumed to have “on hand” and need not keep track of any expendable items equal in value to 1/1000th the amount a character of their level (character level or effective character level) should have according to table 5-1 on page 135 of the Dungeon Master’s Guide. 1st level characters can be assumed to have “on hand” any expendable items worth less than 1 gp per individual unit (this includes regular arrows, crossbow bolts, sling bullets and shuriken). At higher levels this can include expendable magic items, such as potions and scrolls.