The Costco hotdog, as depicted in promotional in-store material Warehouse retailer Costco is famed for its $1.50 beef hotdogs, which come with a 20 oz. soda and haven't gon up in price since its 1980s debut. Occasionally rumors of a price increase spread, only to be squashed by the company's management ; co-founder Jim Sinegal once threatened a previous CEO with death if he considered it. The latest news is in fact a new addition to the deal: an option for bottled water. Costco has quietly rolled out a hot dog and bottled water combo, giving Costco members the choice to swap the traditional 20-ounce refillable fountain soda for a 16.9‑ounce bottle of Kirkland Signature water—all while keeping the price at $1.50. The hot dog hasn't changed. It's still the same quarter‑pound, all‑beef staple served on a soft bun, with classic condiments available at the food court. What's new is the flexibility for shoppers who don't want soda now have an official alternative.…