This study evaluated restaurant managers’ knowledge and support of a healthy default beverage policy in Delaware that had passed, but not yet gone into effect. We conducted structured in-person interviews with managers (n = 50) from full-service and quick-service chain and non-chain restaurants (QSRs) using a stratified random sample. Managers were interviewed about the number of bundled meals sold, beverage sales with those meals, and awareness and perceptions of the policy. On average, QSRs sold significantly more bundled kids’ meals per week (281) compared to full-service restaurants (111), and managers from chain restaurants reported selling significantly more bundled kids’ meals per week (233) compared to non-chain restaurants (91). Managers reported 72.5% of those meals were sold with a healthier beverage (water, milk, or 100% juice), consistent with the forthcoming policy, while 28% were sold with SSBs. Furthermore, although only three managers (6%) reported knowing about the policy, the majority supported it when it was explained. Our findings indicate general support for the intent of the policy, but suggest the need for tailored implementation approaches and additional education for restaurant managers and staff.