|Ross Byers RPG Superstar 2008 Top 32|
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but under the current magic item rules (and their implications even for simple things), they aren't low cost.
Those formulas are guidelines more than hard rules: the best indicator is to compare against existing items and figure out which a generic character would prefer. For cosmetic items with no mechanical benefit, like the self-chilling mug, that's kind of undefined, since a PC is unaffected by it. The price can be as low as your GM feels is reasonable.
The purifying well bucket, casting a 0 level spell with a defined mechanical benefit might cost a decent amount, but its a community investment and is still probably easier to create than a water treatment plant. It's the kind of thing a church might produce at-cost for the local parish.