I did wedding photography for the best part of 8 years, and many, many weddings have no alcohol. Some had alcohol for the bridal table & parents. Most had beer & wine only. For mine we had pre-dinner drinks, I bought premix ****tails (cosmos) and served them with ice, it was $7.95/bottle which served 4 drinks, and I got a discount from the off-licence for buying and bulk, and returned the unopened for a refund A couple of boxes of bubbly is more expensive than this, and my ****tails just as good for toasting, and a bit of a talking point (and cosmos!!!!! Pink!!!!)

I do agree with having something for toasting though, and if you put it on the invite then people are prepared.