Namaskaram. I usually do abhisekam with purushasuktam and sri suktam mantras. Sometimes with panchamrutam or plain unboiled milk or with turmeric water with sandalwood, pancha I karpooram and fragrant spice mix of elaichi and cloves. And then do archanam. This is the simplest method . I don't know if any other mantras are available. Am a normal house holder. This abhisekam works for me. I don't keep any kala sam. I keep srichakra meru at home. In that only all other panchayatana devatas and other devatas are present. Go for simple things which will workout rather than complicated detailed methods.