Immediate management of patient with suspected liver abscess

A 80 year old male patient was presented with fever of unknown origin (FUO). The primary source was a pericolonic abscess which seeded liver abscesses. Radiological Finding The report says 1. Two large complex hypodensities in the right of lobe of liver. These are new, as previous CT of the abdomen showed a normal liver (3 months prior to the presentation), and suspicious for hepatic abscesses. 2.

Suspected collection posterior to the descending  colon in the upper pelvis worrisome for an abscess. A CT of the lower abdomen and pelvis using water-soluble rectal contrast is needed to evaluate for fluid fill loop of bowel. Comprehensive Metabolic Panel (CMP) shows elevated alkaline phosphatase (AP) but normal AST/ALT. What should be the immediate medication and management? Any more diagnostic test needed?