Increase water comsumption, cut back on salt intake. Sometimes too little salt can be the cultprit too, might have to add a little into your diet (however I highly doubt this to be the case). This should lower Antidirectic Hormone and kick out some water.
Also keep an eye on carb intake, inparticular simple ones and maybe throw in a little cardio. This should work 99% of the time if your test e dosing is moderate. Absoulute last resort AI, not recommended though, better off cutting back on your test e doses.