Bigger Washer Bottle?

[rfn]

Has anyone fitted a bigger washer bottle to their MX-5? Doing a few long motorway journeys over the past couple of weeks has meant that I've run out of fluid a few times - and especially in this weather it is obviously silly to refill with just water.

My last couple of cars had a 5 litre bottle, and I was wondering if fitting one of these might be possible - there certainly looks to be room under the bonnet?

Cheers

[rfn]

It's actually a Mk2. I wonder if I could use some of those holder to add an additional bottle...