open half of the bottles, take a little from each, mix well, and use one of the tests. if the test finds no poison, drink them all. if it finds poison, put the other half aside as safe.
2. repeat another six times with the suspicious set of bottles.
if you're lucky, you'll still have 50 unopened bottles
if you're very unlucky, you'll have opened and drunk some 98 botles, and be so drunk that you'll end up mixing things up and drinking the wrong one at the end