What foods to avoid while taking dicloxacillin?

There is no particular food that you need to avoid while taking dicloxacillin.

There are however 2 general cautions about food and lifestyle.

Moderate Food Interaction

Certain penicillins may exhibit reduced gastrointestinal absorption in the presence of food. The therapeutic effect of the antimicrobial may be reduced.

MANAGEMENT: The interacting penicillin should be administered one hour before or two hours after meals. Penicillin V and amoxicillin are not affected by food and may be given without regard to meals.
High Blood Pressure (Hypertension)

Moderate Potential Hazard, High plausibility
dicloxacillin - sodium

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Each 250 mg capsule of dicloxacillin sodium contains approximately 14 mg (0.6 mEq) of sodium, and each teaspoonful of the 62.5 mg/5 mL oral suspension contains approximately 67 mg (2.9 mEq) of sodium. The sodium content should be considered in patients with conditions that may require sodium restriction, such as congestive heart failure, hypertension, and fluid retention.

http://www.drugs.com/food-interactions/dicloxacillin.html