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You might find this online database of purine content of foods useful: http://foodhealth.info/purine/ Just sort foods by purine content and avoid those highest in purine.

Another site that can be useful for potassium content of foods is http://foodhealth.info/potassiumrichfoods/ . Each food's potassium content is compared with that in banana and you can sort the whole or a category or some of the database. For example, raw broccoli has almost as much potassium as banana (90%) while orange…

For GERD, you might want to google "low acid diet food database" to choose low acid food. For lactose intolerance, google "lactose content of foods".

Google "potassium counter". There are online databases for searching and sorting thousands of foods for potassium content.

There are many online databases where you can check potassium content of foods. Just google "potassium content of foods" or "potassium counter".

This online database is useful to find foods without lactose: http://health-diet.us/lactose/ Some cheeses (such as parmesan and cheddar) have less lactose per ounce than other hard cheeses. While cream cheese and cottage cheese are high in lactose.