Well I'm not extremely educated in the field of equipment, so I was just curious as to what is the best way to cover multiple sounds of the dead the easiest. Like for example is there a pedal that has many built in functions/presets that nail the sound, or something along that line.
oh now THAT's a can of worms!
Short answer - no.
Long answer - well... it just depends on how much you REALLY want to get HOW close to "the sound".
There's an awful lot of us that have spent an enormous amount of time, money, research, sweat and solder to really get that sound down. It seems to be almost like a mirage - in that as soon as you think you're close it's always just a little further away.
There's a whole science to it. I don't think that there exists any multi effects pedal that can really get the sound. You might find something that will give you elements of what you want - and you might be happy with just that. But, if you are like the rest of us nut cases in here - once you get used to it you will begin to realize it's shortcomings and seek out better things to get "the sound".
For a decent chunk of change you can get the right components that will get you VERY close to the sound that you are looking for.
Another question though - which sound do you mean? Jerry or Bobby? Then which era do you mean?
Most of the sound is created from the specific hardware that was used - amp, speakers, pickups, guitar modifications, amp modifications... and THEN effects.
Welcome to the first stage of Gear Acquisition Syndrome.