With the new OTC aids / HIV test, does it give you unreliable results if you've been drinking (beer or wine) and eating around the time of the test?

15-30 minutes. You should not eat, drink, or chew gum 15 minutes prior to the test or use oral care products or alcohol for 30 minutes prior to the test.
No. In general, food and/or alcohol intake does effect the results of otc HIV tests, which test for the presence of HIV antibodies. However, since these are usually oral swabs, need to follow manufacturer's guidance with respect to eating drinking immediately before testing, as residual food or drink could interfere with the test's accuracy.