How can I attach a suction grab bar to 1" ceramic tile wall with grout

You could use some E 6000 glue also. I have found that that sticks to anything.

If this grab bar is for supporting weight, you might consider having it professionally installed through the tile into a stud. I'm not sure any glue would support the weight of someone losing their balance. I'd be interested in anyone's experience with this.

You have to find studs & drill holes for screws. Good luck

Tile is too small to support suction cups for such an important item. I wouldn't trust it; go with screwing it in. With the proper tools it's pretty simple; I did it last summer and it's still on the wall! You'll need the following:

Screw-mounted grab bar

Power drill

Drill bit specifically for tile in size specified in the bar's installation manual

Stud finder

Painter's or masking tape

Sharpie

Safety glasses

Shop Vac or broom/dustpan

Using the stud finder, locate the stud(s) where you wish to install the grab bar. Once found, hold the grab bar up to the wall. Cover the tile under the screw holes where the bar will be installed with painter's tape. Poke a Sharpie through the screw holes on the grab bar to mark on the wall where you will be drilling the screw holes.

Now, put on your safety glasses. Put the tile drill bit on the drill and position the bit over the Sharpie dot you made. Drill the hole, taking care to go SLOWLY and not force the drill. The tape will provide much-needed traction for the bit as the tile is very slippery and this is not a place you want the drill to slip! The first hole will be the scariest one to drill but you'll feel exhilarated when it's done.

Finish drilling the rest of the holes, then peel off the tape. Now, step back and freak out over the amount of dust and tile shards all over the bathroom (don't worry; the Shop Vac will make cleanup very easy).

Install the grab bar using the screws provided with it per the instructions.

Pat yourself on the back; you did it!

For safety's sake I agree with Nancy's recommendations.

Stick it only to the tiles!

I agree not many glues are acceptable and reliable enough for human weight, but remember several grab bars have powerful anchor plates but very insecure and minimal bar attachment plates and screws. Only use bars where the actual bar itself is screwed all the way through to a stud or anchor.

I would not put in a suction bar because they are not reliable when depended on. The only way to do this is to find the studs and drill into the studs for attachment.