Well, how would you define as in no access to water and lava? As in, you're playing the skyblock survival map challenge? Or just that it isn't very convenient for you to travel to and from from your base to the surface to collect them?
If it is the former, well, working it out is the challenge.
If it is the latter, just grab 2 buckets of water so you can have a infinite water source. Then grab at least a bucket of lava.
As KhrFreak stated, have a charcoal farm up and running and you should be able to power gour AE and more.
Use an Igneous Extruder to make cobblestone. Use your excess (I hope you do) power to run your Magma Crucible to melt the cobblestones into lava so you have lava to make obsidian.
Pricey in terms of power but at early game, you only need a handful of obsidian anyway and not a boatload of them.
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