Del. Code tit. 4, § 711

Alcoholic liquor in bottles, procured by the holder of a license to resell for the purpose of delivering the same to consumers, shall be kept in the bottles in which it was procured. As long as any such bottle bears the mark or label which it bore when delivered, no other alcoholic liquor, substance or liquid shall be put therein, and no holder of a license, nor anyone on the licensee’s behalf, after the alcoholic liquor bottled in 1 of the bottles has been poured out, may refill the bottle, either wholly or in part, with intent to supply alcoholic liquor or any other substance or liquid to any consumer.