What is the law on drinking in parking lot at budget suites?

There is no statute in Lewisville to prohibit public consumption of alcohol, unless they are in a city park. You will find relevant information in Sec. 10-71. - Possession of alcoholic beverages in our code of ordinances: https://library.municode.com/tx/lewisville/codes/code_of_ordinances?nodeId=PTIICOOR_CH10PARE_ARTIIIPA_S10-71POALBE

I'm not necessarily the expert but i'm pretty Sure that even though it's private property it's a public parking lot