Regular contacts for astigmatism?

I regularly wear contacts for my astigmatism but my last pair ran out a while ago and they are quite pricey. At the moment, I'm paying out for a lot of things and I know my eyesight is important but it's not a problem for me to wear my glasses regularly. But, next week I have an occasion to go to where I would like to wear contacts.So, my question is, how should I adjust my prescription for regular contacts?
I have looked online and I can get a months worth of dailies for £12.50 which will do until I can get my correct lenses.
My prescription is;
R - BC: 8.7 D: 14.0 Power: -6.5 Cylinder: -0.75 Axis: 20
L - BC: 8.7 D: 14.0 Power -4.5 Cylinder: -1.75 Axis: 160

Any help? Should I up the powers or just order them as normal?
Added (1). Thanks Footprintz! I'll do that. And yes, I'm getting the two boxes:)
I'll go back to my regular contacts soon, this is just for the short term and my prescription is valid:)

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