If your joints measure 1/8 inch or larger, you should choose sanded cement-based grout, while if your joints are smaller than 1/8 inch, unsanded cement-based grout is a better choice. Cement-based grout is the type of grout most commonly used on shower tile joints. Resin grout is alcohol-based rather than water-based.
We had a new walk in shower installed about 10 months ago. We noticed the grout on the walls and floor around the shower were fading. The tile is brown swirl with med...
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Whatever brand you local diy store stocks will be fine. The important thing is whether to use sanded or unsanded grout. http://homeguides.sfgate.com/sanded-vs-nonsanded-grout-tile-93501.html
This is a start. Follow the link for more.
Best Grout for shower
If your joints measure 1/8 inch or larger, you should choose sanded cement-based grout, while if your joints are smaller than 1/8 inch, unsanded cement-based grout is a better choice. Cement-based grout is the type of grout most commonly used on shower tile joints. Resin grout is alcohol-based rather than water-based.
https://www.bing.com/search?q=best+grout+to+use+for+shower&form=EDGEAR&qs=PF&cvid=aed69d0fabba4755816c8473867c301b&cc=US&setlang=en-US