crack in foundation wall, QUIKRETE Hydraulic Water-Stop Cement
If you already have purchased the product, you will have no choice but to work fast. You will definitely need to make more than one batch. Just get the new batch made as soon as you can, using more than one bucket if you need to save time from having to clean the mess of the first bucket.

I seen the method they prefer for small cracks, applying it by hand. I would suggest trying a masons slick



They come in various widths, from 1/4" to 3/4" and possibly wider. I would try a 1/2" to get the cement in the bottom of the cut and fill it up about halfway with the first mix and top it off with the next mixes. This tool may take some getting used to and you may be better off cramming it in by hand. But this is what I would at least try.