SAN LUIS OBISPO, CA— Jonathan Andriesko's weekend acid trip was better planned than his trip to Arizona last month, friends of the 22-year-old video-store clerk reported Monday. "Jon spent hours making sure everything was right," coworker Craig Jaeger said. "He requested two days off from work well in advance, rented 2001: A Space Odyssey, filled up his CD changer with Aphex Twin and Boards Of Canada discs, took the phone off the hook, stocked up on vitamin-C tablets, set up all the food he was going to need for the next 12 hours... You'd think he was planning a wedding." By contrast, Andriesko merely expressed vague plans to "get going sometime Saturday" before embarking on a mid-March trip to Scottsdale.