During your travel to and from Rohtas Fort, you will find number of good hotels and restaurants. You can have a stopover at any one and have have a meal or fast food or even refreshment. The good ones are;

Al-Kausar Hotel
Near town of Dina when driving towards Islamabad

Iqbal Hotel
Near town of Dina when driving towards Islamabad

Al-Bilal Hotel
Near town of Dina when driving towards Lahore