For a while, females in Oklahoma could buy 3.2 beer at 18, but men had to be 21. That law was struck down in 1976 as unconstitutionally discriminatory against men. Then the feds forced everyone to go to 21 or lose federal highway dollars (thanks, Libby Dole).
Oklahoma state law requires the liquor ordinances of municipalities and counties to conform to the state Alcoholic Beverage Control Act, and prohibits local jurisdictions from enacting penalties more severe than those of the state law. As a result, there can be no dry cities or counties in Oklahoma.
As for Texas, things are pretty quirky -
https://en.wikipedia.org/wiki/List_of_dry_communities_by_U.S._state#cite_note-VA_ABC_2013-113Of Texas's 254 counties, 7[110] are completely dry, 194[110] are partially dry or "moist", and 53 are entirely wet. The vast majority of entirely wet counties are in southern border regions of Texas near Mexico, or in the south central portion. The patchwork of laws can be confusing, even to residents[citation needed]. In some counties, 4% beer is legal. In others, beverages that are 14% or less alcohol are legal. In some "dry" areas, a customer can get a mixed drink by paying to join a "private club," and in some "wet" areas a customer needs a club membership to purchase liquor by-the-drink, reports the Fort Worth Star-Telegram.
A bill passed in 2003 by the Texas Legislature allows for Justice of the Peace precincts to host alcohol option elections. To date, this law has allowed many JP precincts, particularly in East Texas, to allow a vote that has resulted in many previously dry counties becoming "moist" and allowing sales of beer and wine, but not liquor.[112]
Texas law prohibits off-premises sale of liquor (but not beer and wine) all day on Sunday, Thanksgiving Day, Christmas Day, and New Year's Day. Off-premises sale of beer and wine on Sunday is only allowed after 12:01 pm.
Texas law also prohibits the sale of alcohol in any "sexually oriented business" in a dry county. Strip clubs in these dry counties often sell "set ups" (a cup with coke, ice, and a stirrer to which one can add their own alcohol) and have a BYOB policy to allow patrons to bring their own alcohol into the establishment.