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Firstly I would acquire petroleum (gasoline for US citizens) and diesel fuel from either a rural farm house I know of that stores a significant quantity of diesel fuel or an industrial complex with large tanks I am also aware of.
I'd acquire petroleum as well as diesel - and hopefully collect a large quantity of both.
Following that, I'd venture to a Gardening/Hardware store I live nearby.
Gardening supplies I would seek include: fertiliser, quality seed raising mix, pest control chemicals, fencing wire, plastic pots, irrigation fittings and rubber sheeting.
Hardware supplies I would attempt to acquire include: fixings (nails, screws, rivets), steel, rubber matting, plumbing supplies, padlocks, batteries, specialist tools, welding wire, chemicals (chlorine, kerosene, engine oil), light bulbs/light fixtures and electrical cabling.
I wouldn't attempt going near any food stores or petrol (gas) stations for at least six months after SHTF because I am sure those locations would be a killzone due to other survivors.
I already have a significant quantity of seeds and the knowledge required to cultivate my own crops. I am also able to find my own clean drinking water, as well as having an extensive rain water catchment system where I'm currently living. I will be able to "hole up" inside my house for at least six months before any "bug out" type situation is required.
While the prospect of raiding/looting other stores in the area would be tempting, I don't think I'd risk it. The fuel, gardening and hardware supplies would totally complete my preparations.