The easiest way to fill the squeeze bottles is to put your icing in a ziploc sandwich bag or something similar, clip the corner off and squeeze it into the bottle.
I use a small diameter dish to mix my colored icing in, and when it's the right consistency, I can pour it into the bottle carefully. The smaller the diameter of the bowl, the easier this is to do. If the icing is too thick, it comes in big globs and will make a huge mess, though. I hold the bowl up about 4 inches above the bottle and use a spoon to ease a bit of the icing over the edge. As it starts to fall, it stretches out into a thin ribbon of icing, and as it goes into the bottle I tip the bowl a bit so it continues to flow, helping with the spoon as necessary.
My father in law watched me do this once and said I must be the only person on the planet that could make that work without spilling
, but I truly believe anybody can do it with a little practice! 
hth!
Laura.
I use a small diameter dish to mix my colored icing in, and when it's the right consistency, I can pour it into the bottle carefully. The smaller the diameter of the bowl, the easier this is to do. If the icing is too thick, it comes in big globs and will make a huge mess, though. I hold the bowl up about 4 inches above the bottle and use a spoon to ease a bit of the icing over the edge. As it starts to fall, it stretches out into a thin ribbon of icing, and as it goes into the bottle I tip the bowl a bit so it continues to flow, helping with the spoon as necessary.
My father in law watched me do this once and said I must be the only person on the planet that could make that work without spilling
, but I truly believe anybody can do it with a little practice! hth!
Laura.
Always looking for better ways 
Thanks
