Grass on the drive

Hello everyone. A little help please.
I haven't been very active in the garden due to very ill health last year/this year and my problem is that the lawns have crept over the sides of my drive by about a foot each side. There is no edging as such, I used to keep it all clipped short with a natural edge between grass and gravel.
I'm not fit and bendy enough to get out there on my hands and knees so I'm looking for a weed killer to do the job for me. A dissolvable one for the watering can would be easier that a spray I should imagine.
Any ideas ?
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...and if you don't have a half-moon edger you can use a sharp spade.
Thanks for the responses.
I do have a half moon and a spade but not a lot of strength to use them !
I'll wait for a good day, (health and weather) and make sure I can carry a watering can without slopping it everywhere !
Thanks Verdun, I'm recovering from a brain tumour and kidney cancer so slowly is the only way for me at the moment.
Wessex Wellies...Have you thought about a weed torch to scorch the grass rather than use weedkiller? It will finish them off without the hard work of digging and the use of pesticides. Also weedkiller may kill more than you need where as the torch you can control a little easier. Bought my for around £25 so long term is cheaper than weedkiller. Good luck with the recovery. I am 15 years post Kidney cancer too.
Emma Lou that's a good idea. Aldi have them for £14 at the moment.
I'd have to be careful not to set the whole front garden on fire though ! Could be a disaster !!
Thank you both for your good wishes.